Exodus 6:2-3
Exodus 6:2-3 AMP
Then God spoke further to Moses and said to him, “I am the LORD. [Ex 3:14] I appeared to Abraham, to Isaac, and to Jacob (Israel) as God Almighty [El Shaddai], but by My name, LORD, I did not make Myself known to them [in acts and great miracles]. [Gen 17:1]