Isaiah
Isaiah 42:10ESV·traditional attribution

Sing to the LORD a new song, his praise from the end of the earth, you who go down to the sea, and all that fills it, the coastlands and their inhabitants.

John Calvin Reformed @genevareformer

10. Sing to Jehovah. He now exhorts the people to gratitude; for God’s favors ought always to excite us, by the remembrance of them, to give thanks and to celebrate his praises. Besides, by that exhortation he calls believers to behold the prophecy as actually accomplished, and confirms those promises of which he spoke.

Matthew Henry Presbyterian @wholebiblehenry

Here is I. The covenant God made with and the commission he gave to the Messiah, Isa 42:5-7, which are an exposition of Isa 42:1, Behold my servant, whom I uphold. 1. The royal titles by which the great God here makes himself known, and distinguishes himself from all pretenders, speak very much his glory (Isa 42:5): Thus saith God the Lord. And who are thou, Lord?

Commenting on Isaiah 42:5-12

John Gill Reformed Baptist @doctorgill

Sing unto the Lord a new song,.... On account of the new things before prophesied of, and now done; on account of redemption and salvation by Christ, and the conversion of the Gentiles through the light of the Gospel brought among them; the song of redeeming love, and for the Gospel, and regenerating grace; and not the Jews only, but the Gentiles also, are called...