Midrash su II Samuele 24:15

R. Huna said: "How little does he whom the Lord supports, need to grieve or trouble himself. Saul committed only one sin and was discharged from royalty. David committed two sins, and yet retained it." "Saul committed only one sin." What was it? That of Agag. But did he not commit another sin when he massacred the priests of Nob? Nevertheless only at the incident of Agag it is written (I Sam. 15, 11) I regret that I have set tip Saul as a king. "David committed two sins." What are they? That of Uriah and his numbering of Israel. But there is a third one? That of Bath Sheba? For Bath Sheba he was punished, as it is written (II Sam. 12, 6) For the ewe he shall pay fourfold. What were the four punishments? The death of Bath-Sheba's first child, the death of Amnon, the misfortune of Tamar, and of Absalom. If so, then, was he punished also for numbering Israel? As it is written (II Sam. 24, 15) And the Lord sent a pestilence in Israel from the morning even to the time appointed. In that case he himself was not punished, but in the instances we mentioned, he was personally punished, as R. Juda said in the name of Rab: "For six months David became leprous, and the Sanhedrin separated themselves from him, and the Shechina departed from him, as it is said (Ts. 119, 79) Let those that fear Thee return unto me, and those that knew Thy testimonies, and it is written again (Ib. 51, 14) Restore unto me the gladness of Thy salvation." But has not Rab said that David listened to slander? [Hence he committed more sins?] The former statement is in accordance with the opinion of Samuel who holds that David did not listen to slander. And Rab who holds that David did listen, explains that David had also been punished for it; for R. Juda said in the name of Rab: "At the time when David said unto Mephibosheth (II Sam. 19, 30), Thou and Ziba shall divide the field, a Bath-Kol went forth and said, 'Rechabam and Jeroboam will divide thy Kingdom.' "

Alternatively: (Deuteronomy 17:14) "And you will say, 'I will appoint for me a king..." - Our rabbis said: Said the Holy One, blessed be He, "You want kings in this world. Jewish kings will be appointed, and they will make you fall by the sword." Shaul caused them to fall at Mt. HaGilboa. How do we know? (I Samuel 4:17) "And Israel fled from before the Philistines..." David caused a plague to be sent, as it says, (II Samuel 24:15) "And God sent a pestilence to Israel..." Achav stopped up the rains from them, as it says (I Kings 17:1) "...there shall not be dew nor rain these years..." Tzidkiyahu caused the destruction of the Holy Temple. Once Israel saw what happens under the rule of their kings, they all began to cry out, "We don't want a king of Israel! We want our furst King: (Isaiah 33:22) "For God is our judge, God is our law-giver, God is our king, He will save us!" The Holy One, blessed be He, said to them, "By your lives, thus will I do." How do we know? As it says, (Zachariah 14:9) "And God will be the king over all the earth..."