Genesis 18:22

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

The men ... went toward Sodom: but Abraham stood yet before the Lord. The two who departed are generally supposed to be the angels whose arrival in Sodom is described, Genesis 19:1. But it has become a subject of much discussion whether the third was the Lord before whom Abraham stood, or whether the third had separated from the two messengers on the way to Sodom, and the Lord denotes the altar where the patriarch usually worshipped.