Genesis 18:1-2

Isaac's Birth Promised

¹ And the Lord appeared to him by the _o oaks ₁ of Mamre, as he sat at the door of his tent in the heat of the day. ² He lifted up his eyes and looked, and behold, three men were standing in front of him. _p When he saw them, he ran from the tent door to meet them and bowed himself to the earth

1. Cross References
   Genesis 13:18
   So Abram moved his tent and came and settled by the oaks of Mamre, which are at Hebron, and there he built an altar to the Lord.
   Genesis 14:13
   Then one who had escaped came and told Abram the Hebrew, who was living by the oaks of Mamre the Amorite, brother of Eshcol and of Aner. These were allies of Abram.
   
2. Cross References
   Genesis 19:1
   The two angels came to Sodom in the evening, and Lot was sitting in the gate of Sodom. When Lot saw them, he rose to meet them and bowed himself with his face to the earth
   Hebrews 13:2
   Do not neglect to show hospitality to strangers, for thereby some have entertained angels unawares.