Genesis 18:1-2 New Revised Standard Version (NRSV)
A Son Promised to Abraham and Sarah
18 The Lord appeared to Abraham[a] by the oaks[b] of Mamre, as he sat at the entrance of his tent in the heat of the day. 2 He looked up and saw three men standing near him. When he saw them, he ran from the tent entrance to meet them, and bowed down to the ground.