When the men got up to leave, they looked out over Sodom, and Abraham walked along with them to see them off.
16. And the men rose up from thence . Moses again calls those men, whom he had openly declared to be angels . But he gives them the name from the form which they had assumed. We are not, however, to suppose that they were surrounded with human bodies, in the same manner in which Christ clothed himself in our nature, together with our flesh...
The messengers from heaven had now despatched one part of their business, which was an errand of grace to Abraham and Sarah, and which they delivered first; but now they have before them work of another nature. Sodom is to be destroyed, and they must do it, Gen 19:13. Note, As with the Lord there is mercy, so he is the God to whom vengeance belongs.
Commenting on Genesis 18:16-22
And the men rose up from thence,.... From their seats at Abraham's table under the tree, all three of them: and looked toward Sodom; set their faces and steered their course that way, by which it appeared they intended to go thither: the Targum of Jonathan says, that he that brought the news to Sarah went up, to the highest heavens, and two of them...