Matthew Poole and continuators on Exodus 17:15

15 And Moses built an Altar and called the name of it JEHOVAH-nissi.

Both for the offering of sacrifices of praise unto God, and to be a monument of this victory and of the Author of it.

viz. Of the Altar, which he so calls metonymically, because it was the sign and monument of Iehovah Nissi; even as circumcision is called Gods covenant. Gen. 17. 13. and the lamb the passeover, Exod. 12. 11. and the cup, the new Testament, Luk. 22. 20. because they were the signs of them. Or the word, altar, is to be repeated out of the former member, which is frequent, and the place to be read thus, he called the name of it, the altar of Iehovah nissi. Or the name given to it signifies onely the inscription ingraven upon it, which was not the single name of God, but an entire sentence, the lord is my banner. By which words he takes all the praise of the victory from the Israelites, and gives it to God.

Marginal references: That is, the LORD my [illegible: 1 word] ner.