Genesis 18:2, 17, 22, 31

So he lifted his eyes and looked, and behold, three men were standing by him; and when he saw them, he ran from the tent door to meet them, and bowed himself to the ground

And the LORD said, “Shall I hide from Abraham what I am doing

Then the men turned away from there and went toward Sodom, but Abraham still stood before the LORD.

And he said, “Indeed now, I have taken it upon myself to speak to the Lord: Suppose twenty should be found there?” So He said, “I will not destroy it for the sake of twenty.”