In Alma 5:9, Alma says, "their souls did expand, and they did sing redeeming love." Now according to Hugh Nibley, here we have [a verse referring to] the song of redeeming love, which is a very interesting thing mentioned also in Alma 5:26. Remember, the old temple rites were last performed in Lehi's generation. After that, Jerusalem was destroyed. Well, it was rebuilt again, but they [the Jews] never restored these rites [like singing the song of redeeming love] again. This is where you have to go to the Book of Mormon for the old rites the way they were performed. And this is the way we find them in the law of Moses, too. . . .
I've heard people actually say that the Book of Mormon can't contain the fullness of the gospel because it doesn't have anything about the temple in it. Well, don't fool yourself. It has all the ordinances in it, in their old form. This is an interesting thing because with the destruction of Jerusalem in the time of Lehi these rites disappeared and were never renewed again. The second temple didn't have this, so the Nephite people preserved it. They preserved the rites in their old form not in the later form. That's what we have in the Book of Mormon. . . .
Archaeologists have found allusions to the song of redeeming love in paintings preserved in the oldest known synagogue, the ruin of Dura Europos, discovered in 1932. . . . [Hugh W. Nibley, Teachings of the Book of Mormon, Semester 2, pp. 281-282, 274, 287] [See the commentary on Alma 5:26; 26:13]