Luke
Luke 1:72ESV·traditional attribution

to show the mercy promised to our fathers and to remember his holy covenant,

John Calvin Reformed @genevareformer

72. To perform the mercy Zacharias again points out the fountain from which redemption flowed, the mercy and gracious covenant of God. He assigns the reason why God was pleased to save his people. It was because, being mindful of his promise, he displayed his mercy.

Matthew Henry Presbyterian @wholebiblehenry

We have here the song wherewith Zacharias praised God when his mouth was opened; in it he is said to prophesy (Luk 1:67), and so he did in the strictest sense of prophesying; for he foretold things to come concerning the kingdom of the Messiah, to which all the prophets bear witness. Observe, I.

Commenting on Luke 1:67-80

John Gill Reformed Baptist @doctorgill

To perform the mercy promised to our fathers,.... By "mercy" is meant salvation by Christ, which springs from the mercy of God; the promise of which was an instance of mercy to the Jewish fathers under the Old Testament, and also the performance of it; for they were saved by the grace of our Lord Jesus, even as we: his blood was shed for the...