Mosiah 15

The priests of Noah asked Abinadi -

"...What meaneth the words which are written, and which have been taught by our fathers, saying:
21 How beautiful upon the mountains are the feet of him that bringeth good tidings; that publisheth peace; that bringeth good tidings of good; that publisheth salvation; that saith unto Zion, Thy God reigneth..." (Book of Mormon Mosiah 12:20 - 21)

I think this was a very interesting question that the wicked priest would ask Abinadi. The question continues -

"Thy watchmen shall lift up the voice; with the voice together shall they sing; for they shall see eye to eye when the Lord shall bring again Zion;
23 Break forth into joy; sing together ye waste places of Jerusalem; for the Lord hath comforted his people, he hath redeemed Jerusalem;
24 The Lord hath made bare his holy arm in the eyes of all the nations, and all the ends of the earth shall see the salvation of our God?" (Book of Mormon Mosiah 12:22 - 24)

Did these worldly priests think that descendants of Jerusalem would be freed or redeemed just because they were the supposedly "chosen people". Abinadi immediately rebuffs them -

"Are you priests, and pretend to teach this people, and to understand the spirit of prophesying, and yet desire to know of me what these things mean?
26 I say unto you, wo be unto you for perverting the ways of the Lord! For if ye understand these things ye have not taught them; therefore, ye have perverted the ways of the Lord.
27 Ye have not applied your hearts to understanding; therefore, ye have not been wise." (Book of Mormon Mosiah 12:25 - 27)

After delivering one of the greatest lessons in all of scripture on the Savior and the atonement, Abinadi answers their first question -

"...whosoever has heard the words of the prophets, yea, all the holy prophets who have prophesied concerning the coming of the Lord—I say unto you, that all those who have hearkened unto their words, and believed that the Lord would redeem his people, and have looked forward to that day for a remission of their sins, I say unto you, that these are his seed, or they are the heirs of the kingdom of God.
12 For these are they whose sins he has borne; these are they for whom he has died, to redeem them from their transgressions. And now, are they not his seed?
13 Yea, and are not the prophets, every one that has opened his mouth to prophesy, that has not fallen into transgression, I mean all the holy prophets ever since the world began? I say unto you that they are his seed." (Book of Mormon Mosiah 15:11 - 13)

Therefore it is they who have opened their mouths to prophesy or bear testimony of Christ -

"these are they who have published peace, who have brought good tidings of good, who have published salvation; and said unto Zion: Thy God reigneth!
15 And O how beautiful upon the mountains were their feet!
16 And again, how beautiful upon the mountains are the feet of those that are still publishing peace!
17 And again, how beautiful upon the mountains are the feet of those who shall hereafter publish peace, yea, from this time henceforth and forever!
18 And behold, I say unto you, this is not all. For O how beautiful upon the mountains are the feet of him that bringeth good tidings, that is the founder of peace, yea, even the Lord, who has redeemed his people; yea, him who has granted salvation unto his people..." (Book of Mormon Mosiah 15:14 - 18)