In this post, we'll look at the curious example of Psalm 119 and Alma 60:34. It isn't entirely clear whether or not this is a coincidence or intentional. In studying both passages, I've come to a firm conclusion. I'll see if I can convince you to see it my way.
Here is a side-by-side comparison:
115 Depart from me, ye evildoers: for I will keep the commandments of my God. (Psalm 119)
34 And now behold, I, Moroni, am constrained, according to the covenant which I have made to keep the commandments of my God; therefore I would that ye should adhere to the word of God, and send speedily unto me of your provisions and of your men, and also to Helaman. (Alma 60)
On the one hand you have a 6 word phrase that matches word for word. On the other hand, the three most unique words in that phrase are "keep," "commandments," and "God." Those are pretty common, and they naturally fit together. My first instinct was to dismiss this as a coincidence.
My opinion shifted when I looked at both verses in broader context. I knew the context of Alma 60 already -- Moroni is writing an angry letter to Pahoran, accusing him of negligence and treason, and threatening to march his army to Zarahemla and take provisions by force unless Pahoran sends relief.
Psalm 119 is pretty unfamiliar to me, but as I looked at the context, I found a few interesting connections. Below is a side-by-side comparison of both passages, with some color coding to highlight what I believe are similar themes:
Psalm 119 Alma 60
From this side-by-side comparison, I see multiple poetic allusions to the same section of Psalm 119 with the 6-word phrase. A condemnation of vanity. An ominous reminder of the justice/judgements of God against the wicked. Moroni accuses Pahroan of "trampling" the laws of God and suggests he'll be trodden down by God as a result. Mormon hopes in God's word and twice reminds Pahoran to "adhere to" and "fulfil" the word of God.
Pahoran's Response
The details above are enough to convince me this was intentional. Reading Pahoran's measured response to Moroni's fire and brimstone makes it even clearer:
12 We would subject ourselves to the yoke of bondage if it were requisite with the justice of God, or if he should command us so to do.
13 But behold he doth not command us that we shall subject ourselves to our enemies, but that we should put our trust in him, and he will deliver us. (Alma 61)
Compare to three Psalms:
1 O Lord my God, in thee do I put my trust: save me from all them that persecute me, and deliver me: (Psalm 7)
20 O keep my soul, and deliver me: let me not be ashamed; for I put my trust in thee. (Psalm 25)
1 In thee, O Lord, do I put my trust; let me never be ashamed: deliver me in thy righteousness. (Psalm 31)
Conclusion
Is this intentional? In my mind, there is no doubt that both Moroni's accusation and Pahoran's meek reply contain clear references to the Psalms.