Exodus 17:15

And Moses built an altar
On Horeb, as Aben Ezra; on the top of the hill, as Ben Gersom, where sacrifices of thanksgiving were offered up for the victory obtained, or however a monument erected in memory of it:

and he called the name of it Jehovahnissi;
which signifies either "the Lord is my miracle" who wrought a miracle for them in giving them the victory over Amalek, as well as, through smiting the rock with the rod, brought out water from thence for the refreshment of the people, their children and cattle; or "the Lord is my banner": alluding to the hands of Moses being lifted up with the rod therein, as a banner displayed, under which Joshua and Israel fought, and got the victory. This may fitly be applied to Christ, who is both altar, sacrifice, and priest, and who is the true Jehovah, and after so called; and who is lifted up as a banner, standard, or ensign in the everlasting Gospel, in order to gather souls unto him, and enlist them under him, and to prepare them for war, and encourage them in it against their spiritual enemies; and as a token of their victory over them, and a direction to them where they shall stand, when to march, and whom they shall follow; and to distinguish them from all other bands and companies, and for the protection of them from all their enemies, see ( Isaiah 11:10 ) . These words were inscribed upon the altar, or the altar was called the altar of Jehovahnissi, in memory of what was here done; from hence it has been thought ^F1, that Baachus, among the Heathens, had his name of Dionysius, as if it was Jehovahnyssaeus.