Who were the three men who visited Abraham at Mamre?
The three men who visited Abraham at Mamre were the Lord in human form and two angels. Though they appeared as ordinary men to Abraham and later to the people of Sodom, one was the Lord and the other two were angels sent on His mission.
Les teaches that in Genesis 18:2 Abraham looked up and saw three men. One was the Lord in human form, and the other two were angels, as they are identified when they come to Sodom in Genesis 19:1. Outwardly they appeared as men, so the people of Sodom and Lot had no idea they were angels. Les explains that these two angels were sent to put Sodom and Gomorrah on trial, letting the Sodomites prove themselves worthy of sudden destruction.
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,