We all know that the Liahona worked “according to the faith and diligence” of Lehi’s party (1 Ne. 16:28). But how did Lehi’s party know if they were being faithful enough to rely upon the direction given by the Liahona? In other words, because of the nature of the Liahona, its pointers or spindles would have had to point in some
direction at all times, even
during those times of unrighteousness, so how did you know if it was working or
not? How did Nephi, for example, know
that the compass “did cease to work” (1Ne. 18:12) when they were in the middle
of the ocean? In this setting, it would
have been impossible for Nephi to know whether or not the Liahona was pointing
in the right or wrong direction.
Furthermore, after Nephi was untied by his brothers, how did he know
that the spindles were pointing in the right direction again?
And it came to pass after they had loosed me, behold, I took the compass, and it did work whither I desired it (1Nephi 18:21).
In short, how did Lehi’s party know when to trust the direction given by the Liahona, and when not to?
While we may not have all the answers to this particular question, perhaps we have been given enough information to help us make a good assumption.
The first thing we need to remember is that the Liahona had not one, but two spindles. Nephi stated:
And within the ball were two spindles; and the one pointed the way whither we should go into the wilderness (1 Ne. 16:10).
If one spindle pointed the way, what was the purpose of the second spindle? Robert L. Bunker gave us this insight:
“Since a single pointer always “points” in some direction, the additional pointer was necessary to indicate whether or not the first pointer could be relied upon.”
In other words, if there was just one spindle, it would have been impossible to determine if the Liahona was pointing in the right direction. But if there are two spindles, you would know that the Liahona was pointing in the right direction only when both spindles were lined up together and pointing in the same direction. Bunker explained it this way:
“This is how it would have worked: if an observer viewed the pointers and saw only a single pointer, as seen in figure 1, then they were both aligned in the same direction, one on top of the other, and the director was providing correct information. Lehi’s party could then follow the indicated direction with confidence that it was the Lord’s instruction. If, on the other hand, the two pointers were cross-ways to each other—forming an “x” as shown in figure 2—then the device was not functioning, and the pointing information was not reliable.”
In fact, the Lord has said on several occasions that “in the mouth of two or three witnesses shall every word be established” (D&C 6:28), and it appears that the Liahona was no exception.
“We have in the Book of Mormon a most interesting apparatus called the Liahona. Now the chances of finding a genuine Liahona are, to say the least, remote; but what if something just like it showed up in the hands of Lehi’s relatives? That should certainly come as a surprise, and even provoke some thought. The Liahona has given rise to endless merriment and mockery among critics of the Book of Mormon; only the [sixteen] shining stones of the Jaredites can equal it as a laugh-getter. Even the present writer, for all his curiosity about Book of Mormon oddities, has always passed it by in an abashed silence—it was like nothing he ever heard or read of—until the year 1959. For it was in that year that an Arabic scholar by the name of T. Fahd published the evidence that makes it possible for the first time to say something significant about the Liahona.”Nibley introduces this evidence by first giving us a description of an ancient practice of receiving revelation known as Belomancy. As we shall see, Belomancy is very similar to the more commonly known form of receiving revelation anciently, casting lots. Here is how Nibley describes this ancient practice:
“Belomancy is the practice of [receiving revelation] by shooting, tossing, shaking, or otherwise manipulating rods, darts, pointers, or other sticks, all originally derived from arrows. Over ten years ago the present writer made a fairly exhaustive study of ancient arrow-divination…[including] the ritual use of sticks and rods, especially in ancient Israel. Yet it was not until he saw Fahd’s study, the first full-length treatment of old Semitic arrow-divination, that it dawned upon him that these old practices might have some connection with the Liahona. For the most common use of divination arrows, and probably their original purpose, was, according to the forgotten evidence unearthed by the diligent Fahd, the direction of travelers in the desert.”
“Fahd begins by pointing out that the “arrows” used in divination, were devoid of heads and feathers, being mere shafts or pointers…. But why arrows? Because, as we have shown elsewhere, the shooting of arrows is a universal form of [receiving revelation]…for instance, the arrow-prayers of the Indian and Beduin…[were used] to entrust their lives and their fate to a power beyond their control. The consultation of the arrows by one about to marry was also an old Jewish custom; the parties concerned would throw rods into the air, [and would interpret] their message by the manner of their fall…. Other substitutes for shooting [arrows] were shaking or drawing [them] from a bag or quiver.” 
And it came to pass that I, Nephi, beheld the pointers which were in the ball…And there was also written upon them [i.e., the pointers] a new writing, which was plain to be read, which did give us understanding concerning the ways of the Lord; and it was written and changed from time to time, according to the faith and diligence which we gave unto it (1 Ne. 16:28-29).
“Whenever divination arrows are described [anciently], they are invariably found to have writing on them… It is certain that men from the earliest times have sought guidance by consulting the pointings and the inscriptions [on the] headless and tailless arrows.”
Nibley then proceeds to give a few examples of this practice:
“[There] were arrows upon which the Arabs…wrote ‘Command’ and ‘Prohibition’; or upon some of which was written ‘my Lord hath commanded me’; and upon some, ‘My Lord hath forbidden me’…. The zalam [were arrows that] belonged to Kureysh…upon which were written ‘He hath commanded,’ and ‘He hath forbidden,’ and ‘Do thou’ and ‘Do thou not’…[and these arrows were] placed in [the holy shrine of Meccah]…and when a man desired to go on a journey, or to marry, he came to the minister, and said, ‘Take thou forth for me a [arrow]; and thereupon he would take it forth and look at it [in order to receive the message from God].’”
In addition, the Liahona, as we all know, was used mainly by Lehi’s party to receive revelation specifically for travel purposes, and as Nibley has already suggested, these ancient people often used these arrows in receiving inspiration and direction regarding their travels as well. Nibley writes:
“The inscriptions on the arrows themselves give top priority to travel: typical examples from the various systems are “Go slow!” “Speed Up!” “Water!” “Stay where you are!” “Get moving!” “You are in the clear,” etc.”
Nibley then concludes as follows:
“It would be an obtuse reader indeed who needed one to spell out for him the resemblance between ancient arrow-divination and the Liahona: two “spindles or pointers” bearing written instructions provide superhuman guidance for travelers in the desert. What more could you want? But what is the relationship between them? On this the Book of Mormon is remarkably specific. Both Nephi and Alma go out of their way to insist that the Liahona did not work itself, i.e., was not a magic thing, but worked only by the power of God and only for appointed persons who had faith in that power.”
Nibley asks again:
“Was the Liahona, then, just old magic? No, it is precisely here that Nephi and Alma are most emphatic—unlike magic things, these pointers worked solely by the power of God, and then, too, for only those designated to use them.…
“Where, then, does one draw the line between the sacred and the profane? Religion becomes magic when the power by which things operate is transferred from God to the things themselves. As Fahd notes, the Arabs were extremely vague about the powers with which they dealt, as “primitive” people are everywhere. When men lack revelation they commonly come to think of power as residing in things. Did the staff of Moses make water come from the rock or cause the Red Sea to part? Of course not; yet in time the miraculous powers which were displayed through its agency came to be attributed by men to the staff itself.
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 Bunker, “The Design of the Liahona and the Purpose of the Second Spindle,” Journal of Book of Mormon Studies, 3/2 (1994):1.
 Bunker, “The Design of the Liahona and the Purpose of the Second Spindle,” Journal of Book of Mormon Studies, 3/2 (1994):6-7.
 Nibley, Since Cumorah, p. 251.For more information regarding Fahd’s work, including the references sited in Nibley’s Since Cumorah, see, T. Fahd, “Une pratique cléromantique î la Ka'ba préislamique,” Semitica 8 (1958): 61-73.
 See for example Luke 1:9; Acts 1:26; Jonah 1:7; 1 Sam 14:22; 1 Ne. 3:11.
 Nibley, Since Cumorah, p. 255-56.
 Hugh W. Nibley, "The Arrow, the Hunter, and the State,'' WPQ 2 (1949):329-30, 334, citing M. Gaster, Hasting's Encyclopedia of Religion and Ethics 4:810.
 Nibley, Since Cumorah, p. 256- 257. See also Hugh W. Nibley, “The Arrow, the Hunter, and the State,”’ WPQ 2 (1949):329-30, 334, citing M. Gaster, Hasting's Encyclopedia of Religion and Ethics 4:810.
 Nibley, Since Cumorah, p. 257-58.
 Edward W. Lane, Arabic-English Lexicon 2 vols. (London: Williams, 1867) 1:1247, s.v. zalam, as quoted in Nibley, Since Cumorah, p. 256.
 Nibley, Since Cumorah, p. 258-59.
 Nibley, Since Cumorah, p. 259.
 Nibley, Since Cumorah, p. 260-61.