Exodus 6:3
3 And I appeared unto Abraham, unto Isaac, and unto Jacob, by the name of God Almighty, but by my name JEHOVAH was I not known to them.
Exo. 6:3. "And I appeared," etc. God Almighty = all-sufficient, (see Genesis 17:1; Genesis 28:3), ["but by my name Jehovah," etc.]. God, when He appeared unto Abraham, and promised that he would do such and such things for his seed, He appeared as God all-sufficient, a God sufficient to accomplish the things that He then promised. Now the time is come for the accomplishment of them, now He appears as Jehovah, as He that is what He was, or " is that He is," not only sufficient to fulfilling, but actually fulfilling; the same in accomplishing, that He was in promising.