Genesis 18
1 (NIV) The LORD appeared to Abraham near the great trees of Mamre while he was sitting at the entrance to his tent in the heat of the day.  2 Abraham looked up and saw three men standing nearby. When he saw them, he hurried from the entrance of his tent to meet them and bowed low to the groundÉ 16 When the men got up to leave, they looked down toward Sodom, and Abraham walked along with them to see them on their wayÉ 19:1 The two angels arrived at Sodom in the evening, and Lot was sitting in the gateway of the city. When he saw them, he got up to meet them and bowed down with his face to the ground.