Exodus 3:15

This is my name for ever - The name here referred to is that which immediately precedes, יהוה אלהים Yehovah Elohim, which we translate the Lord God, the name by which God had been known from the creation of the world, (see Genesis 2:4). and the name by which he is known among the same people to the present day. Even the heathens knew this name of the true God; and hence out of our יהוה Yehovah they formed their Jao, Jeve, and Jove; so that the word has been literally fulfilled, This is my memorial unto all generations. See Clarke's note on the word Elohim, Genesis 1:1 (note). As to be self-existent and eternal must be attributes of God for ever, does it not follow that the לעלם leolam, for ever, in the text signifies eternity? "This is my name to eternity - and my memorial," לדר דר ledor dor, "to all succeeding generations." While human generations continue he shall be called the God of Abraham, the God of Isaac, and the God of Jacob; but when time shall be no more, he shall be Jehovah Elohim. Hence the first expression refers to his eternal existence, the latter to the discovery he should make of himself as long as time should last. See Genesis 21:33. Diodorus Siculus says, that "among the Jews, Moses is reported to have received his laws from the God named Jao," Ιαω, i.e., Jeue, Jove, or Jeve; for in all these ways the word יהוה Yehovah may be pronounced; and in this way I have seen it on Egyptian monuments. See Diod., lib. l., c. xciv.

The Lord God ... - Better, Jehovah יהוה yehovâh, God of your fathers, God of Abraham, God of Isaac, and God of Jacob. It corresponds exactly to the preceding verse, the words "I am" and "Jehovah" (Yahweh) being equivalent. This name met all the requirements of Moses, involving a two-fold pledge of accomplishment; the pledges of ancient benefits and of a new manifestation.

Name ... memorial - The name signifies that by which God makes Himself known, the memorial that by which His people worship Him.

3:15 The Lord God of our fathers hath sent me unto you - Thus God made himself known, that he might revive among them the religion of their fathers, which was much decayed, and almost lost. And that he might raise their expectations of the speedy performance of the promises made unto their fathers: Abraham, Isaac, and Jacob are particularly named, because with Abraham the covenant was first made, and with Isaac and Jacob oft expressly renewed, and these three were distinguished from their brethren, and chosen to be the trustees of the covenant. This God will have to be his name for ever, and it has been, is, and will be his name, by which his worshippers know him, and distinguish him from all false gods.