And God said unto Moses, I am that I am ,.... This signifies the real being of God, his self-existence, and that he is the Being of beings; as also it denotes his eternity and immutability, and his constancy and faithfulness in fulfilling his promises, for it includes all time, past, present, and to come; and the sense is, not only I am what I am at present, but I am what I have been, and I am what I shall be, and shall be what I am. The Platonists and Pythagoreans seem to have borrowed their το ον from hence, which expresses with them the eternal and invariable Being; and so the Septuagint version here is ο ων : it is said
thus shalt thou say unto the children of Israel, I AM hath sent me unto you ; or as the Targum of Jonathan has it,"I am he that is, and that shall be.'This is the name Ehjeh, or Jehovah, Moses is empowered to make use of, and to declare, as the name of the Great God by whom he was sent; and which might serve both to encourage him, and strengthen the faith of the Israelites, that they should be delivered by him.