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.

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.

And God said moreover unto Moses,.... As a further explanation of the above name, and of the design and use of it:

thus shalt thou say unto the children of Israel: for their further instruction in the said name, and for the confirmation of the mission of Moses, and the success of it:

the Lord God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, hath sent me unto you; he who is Jehovah, and the covenant God of the ancestors of the people of Israel, and of them, so he is called, Ecclesiastes 3:6.

this is my name for ever: meaning either "Ehjeh, I am", in the preceding verse, or, which is the same, Jehovah in this, and so both of them, and including also the name of the God of Abraham, &c. which he was always to be known by:

and this is my memorial unto all generations; the name by which he should be made mention of both by himself and others, and by which he would be called to remembrance by his people, and what he had promised unto them, and done for them.

And God said moreover unto Moses, Thus shalt thou say unto the children of Israel, the LORD God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, hath sent me unto you: this is my name for ever, and this is my memorial unto all generations.

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.

3:11-15 Formerly Moses thought himself able to deliver Israel, and set himself to the work too hastily. Now, when the fittest person on earth for it, he knows his own weakness. This was the effect of more knowledge of God and of himself. Formerly, self-confidence mingled with strong faith and great zeal, now sinful distrust of God crept in under the garb of humility; so defective are the strongest graces and the best duties of the most eminent saints. But all objections are answered in, Certainly I will be with thee. That is enough. Two names God would now be known by. A name that denotes what he is in himself, I AM THAT I AM. This explains his name Jehovah, and signifies, 1. That he is self-existent: he has his being of himself. 2. That he is eternal and unchangeable, and always the same, yesterday, to-day, and for ever. 3. That he is incomprehensible; we cannot by searching find him out: this name checks all bold and curious inquiries concerning God. 4. That he is faithful and true to all his promises, unchangeable in his word as well as in his nature; let Israel know this, I AM hath sent me unto you. I am, and there is none else besides me. All else have their being from God, and are wholly dependent upon him. Also, here is a name that denotes what God is to his people. The Lord God of your fathers sent me unto you. Moses must revive among them the religion of their fathers, which was almost lost; and then they might expect the speedy performance of the promises made unto their fathers.