6 Now it had happened as they were coming home, when David was returning from the slaughter of the Philistine, that the women had come out of all the cities of Israel, singing and dancing, to meet King Saul, with tambourines, with joy, and with musical instruments. 7 So the women sang as they danced, and said: "Saul has slain his thousands, And David his ten thousands." 8 Then Saul was very angry, and the saying displeased him; and he said, "They have ascribed to David ten thousands, and to me they have ascribed only thousands. Now what more can he have but the kingdom?" 9 So Saul eyed David from that day forward.
Matthew Henry's Commentary on 1 Samuel 18:6-9
Commentary on 1 Samuel 18:6-11
(Read 1 Samuel 18:6-11)
David's troubles not only immediately follow his triumphs, but arise from them; such is the vanity of that which seems greatest in this world. It is a sign that the Spirit of God is departed from men, if, like Saul, they are peevish, envious, suspicious, and ill-natured. Compare David, with his harp in his hand, aiming to serve Saul, and Saul, with his javelin in his hand, aiming to slay David; and observe the sweetness and usefulness of God's persecuted people, and the barbarity of their persecutors. But David's safety must be ascribed to God's providence.