19 Then the king turned and said to Ittai, a leader of the men from Gath, "Why are you coming with us? Go on back to King Absalom, for you are a guest in Israel, a foreigner in exile. 20 You arrived only recently, and should I force you today to wander with us? I don't even know where we will go. Go on back and take your kinsmen with you, and may the Lord show you his unfailing love and faithfulness. " 21 But Ittai said to the king, "I vow by the Lord and by your own life that I will go wherever my lord the king goes, no matter what happens-whether it means life or death." 22 David replied, "All right, come with us." So Ittai and all his men and their families went along.
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.