Genesis

Be not forgetful to entertain strangers: for thereby some have entertained angels unawares.

And it came to pass, when Joshua was by Jericho, that he lifted up his eyes and looked, and, behold, there stood a man over against him with his sword drawn in his hand: and Joshua went unto him, and said unto him, Art thou for us, or for our adversaries?

And the men turned their faces from thence, and went toward Sodom: but Abraham stood yet before the Lord.

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;

And Abraham stood up, and bowed himself to the people of the land, even to the children of Heth.