Genesis 18:2, 17, 22, 31

and he lift up his eyes and looked, and, lo, three men stood by him: and when he saw them, he ran to meet them from the tent door, and bowed himself toward the ground

And the LORD said, Shall I hide from Abraham that thing which I do

And the men turned their faces from thence, and went toward Sodom: but Abraham stood yet before the LORD.

And he said, Behold now, I have taken upon me to speak unto the Lord: Peradventure there shall be twenty found there. And he said, I will not destroy it for twenty's sake.