Exodus 6:3

6:3 I appeared to Abraham, to Isaac, and to Jacob as God Almighty, but by my name ‘the Lord’ I was not known to them.

Exodus 6:6

6:6 Therefore, tell the Israelites, ‘I am the Lord. I will bring you out from your enslavement to the Egyptians, I will rescue you from the hard labor they impose, and I will redeem you with an outstretched arm and with great judgments.