I will {k} go down now, and see whether they have done altogether according to the {l} cry of it, which is come unto me; and if not, I will know.

(k) God speaks after the fashion of men: that is, I will enter into judgment with good advise.

(l) For our sins cry for vengeance, though no one accuses us.

Wesley's Notes

18:21 I will go down now and see - Not as if there were any thing concerning which God is in doubt; but he is pleased thus to express himself after the manner of men.

Jamieson-Fausset-Brown Bible Commentary

21. I will go down . and see-language used after the manner of men. These cities were to be made examples to all future ages of God's severity; and therefore ample proof given that the judgment was neither rash nor excessive (Eze 18:23; Jer 18:7).

Matthew Henry's Concise Commentary

18:16-22 The two who are supposed to have been created angels went toward Sodom. The one who is called Jehovah throughout the chapter, continued with Abraham, and would not hide from him the thing he intended to do. Though God long forbears with sinners, from which they fancy that the Lord does not see, and does not regard; yet when the day of his wrath comes, he will look toward them. The Lord will give Abraham an opportunity to intercede with him, and shows him the reason of his conduct. Consider, as a very bright part of Abraham's character and example, that he not only prayed with his family, but he was very careful to teach and rule them well. Those who expect family blessings must make conscience of family duty. Abraham did not fill their heads with matters of doubtful dispute; but he taught them to be serious and devout in the worship of God, and to be honest in their dealings with all men. Of how few may such a character be given in our days! How little care is taken by masters of families to ground those under them in the principles of religion! Do we watch from sabbath to sabbath whether they go forward or backward?