THE LORD APPEARED TO ABRAHAM AT MAMRE

When Abraham raised his eyes and looked up, behold, three men were standing [a little distance] from him. When he saw them, he ran from the tent door to meet them and bowed down [with his face] to the ground,
and Abraham said, “My lord, if now I have found favor in your sight, please do not pass by your servant

ISAAC’S BIRTH PROMISED BY GOD

Then God said to Abraham, “As for Sarai your wife, you shall not call her name Sarai (my princess), but her name will be Sarah (Princess).
I will bless her, and indeed I will also give you a son by her. Yes, I will bless her, and she shall be a mother of nations; kings of peoples will come from her.