Genesis 18:2, 17, 22, 31

He looked up and saw three men standing near him. When Abraham saw them, he ran from his tent to meet them. He bowed facedown on the ground before them

The LORD said, “Should I tell Abraham what I am going to do now?

So the men turned and went toward Sodom, but Abraham stood there before the LORD.

Then Abraham said, “I have been brave to speak to the Lord. But what if there are twenty good people in the city?” He answered, “If I find twenty there, I will not destroy the city.”