Genesis 19:1
"And there came two angels to Sodom at even; and Lot sat in the gate of Sodom: and Lot seeing them rose up to meet them; and he bowed himself with his face toward the ground;"
Cross References (ranked by relevance)
Genesis 18:22
And the men turned their faces from thence, and went toward Sodom: but Abraham stood yet before the LORD.
Hebrews 13:2
Be not forgetful to entertain strangers: for thereby some have entertained angels unawares.
Job 31:32
The stranger did not lodge in the street: but I opened my doors to the traveller.