And David said unto Ittai, go, and pass over,.... It being his resolution to abide with him, he urged him no more to depart, but bid him pass over the brook Kidron before him:

and Ittai the Gittite passed over, and all his men; the six hundred Gittites that were under his command:

and all the little ones that were with him; that belonged to him and his men, and no doubt their wives also.

After this assurance of his devotedness, David let Ittai do as he pleased. ועבר לך, "go and pass on." עבר does not mean to pass by, but to go forward. Thus Ittai and his men and all his family that was with him went forward with the king. By "the little ones" (taph) we are to understand a man's whole family, as in many other instances (see at Exodus 12:37).

2 Samuel 15:22-23

The king crosses the Kidron, and sends the priests back with the ark to Jerusalem. - 2 Samuel 15:23. All the land (as in 1 Samuel 14:25) wept aloud when all the people went forward; and the king went over the brook Kidron, and all the people went over in the direction of (lit. in the face of) the way to the desert. The brook Kidron is a winter torrent, i.e., a mountain torrent which only flows during the heavy rains of winter (χείμαῤῥος τοῦ Κεδρών, John 18:1). It is on the eastern side of Jerusalem, between the city and the Mount of Olives, and derives its name from the appearance of the water when rendered muddy through the melting of the snow (cf. Job 6:16). In summer it is nothing more than a dry channel in the valley of Jehoshaphat (see Robinson, Pal. i. 396, and v. Raumer, Pal. p. 309, note 81). "The wilderness" (midbar) is the northern part of the desert of Judah, through which the road to Jericho and the Jordan lay.

And David said to Ittai, Go and pass over. And Ittai the Gittite passed over, and all his men, and all the little ones that were with him.

15:22 Little ones - For being so deeply engaged for David, he durst not leave his little ones to Absalom's mercy.

15:13-23 David determined to quit Jerusalem. He took this resolve, as a penitent submitting to the rod. Before unrighteous Absalom he could justify himself, and stand out; but before the righteous God he must condemn himself, and yield to his judgments. Thus he accepts the punishment of his sin. And good men, when they themselves suffer, are anxious that others should not be led to suffer with them. He compelled none; those whose hearts were with Absalom, to Absalom let them go, and so shall their doom be. Thus Christ enlists none but willing followers. David cannot bear to think that Ittai, a stranger and an exile, a proselyte and a new convert, who ought to be encouraged and made easy, should meet with hard usage. But such value has Ittai for David's wisdom and goodness, that he will not leave him. He is a friend indeed, who loves at all times, and will adhere to us in adversity. Let us cleave to the Son of David, with full purpose of heart, and neither life nor death shall separate us from his love.