19 Then the king said to Ittai the Gittite, "Why do you also go with us? Go back and stay with the king, for you are a foreigner and also an exile from your home. 20 You came only yesterday, and shall I today make you wander about with us, since I go I know not where? Go back and take your brothers with you, and may the Lord show[1] steadfast love and faithfulness to you." 21 But Ittai answered the king, "As the Lord lives, and as my lord the king lives, wherever my lord the king shall be, whether for death or for life, there also will your servant be." 22 And David said to Ittai, "Go then, pass on." So Ittai the Gittite passed on with all his men and all the little ones who were with him.
Matthew Henry's Commentary on 2 Samuel 15:19-22
Commentary on 2 Samuel 15:13-23
(Read 2 Samuel 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.