Another term (well, phrase) that caught my attention is to sing redeeming love. While the concepts of redemption and love suffuse the scriptures, they are not often brought together. In fact, Alma the Younger and Ammon are the only to speakers to conjoin the terms -- and both of them refer to singing redeeming love.
Love and Redemption are used together in Deut. 7:8 and Isa. 63:9. In both cases, love is given as the reason for the Lord's redemption of His people.
The terms are used together in 2 Ne 1:15. In this case Lehi recognizes of God's love after he testifies of His redemptive power.
Alma the Younger speaks of singing redeeming love in Alma 5:9 and Alma 5:26. In the first instance, he's talking about the fathers of his audience (by context, it seems like he's talking about the people Alma the Elder led in the wilderness). After they've been saved from the bands of death and the chains of hell (physical death and sin) by the Lord's hand, they sing redeeming love. He goes on to ask his audience if they've experienced this change in their own lives, if they have felt to sing the song of redeeming love.
Ammon uses the term in Alma 26:12, applying it to the Lamanites who have experienced conversion through the preaching of the gospel.
The terms are also used together in D & C 133:53 (which quotes Isaiah 63:9).
Alma the Younger and Ammon use the term so similarly that it seems formulaic. But there's no prior use (that I can find). Perhaps (warning -- speculation alert), it was used by Alma the Elder and/or Abinadi but edited out of Mormon's text.