2 Samuel 2:10; 2 Samuel 5:4; 2 Samuel 10:18; 2 Samuel 15:7

2 Samuel 2:10

10 Ishbosheth Saul's son was forty years old when he began to reign over Israel, and reigned two years. But the house of Judah followed David.

2 Samuel 5:4

4 David was thirty years old when he began to reign, and he reigned forty years.

2 Samuel 10:18

18 And the Syrians fled before Israel; and David slew the men of seven hundred chariots of the Syrians, and forty thousand horsemen, and smote Shobach the captain of their host, who died there.

2 Samuel 15:7

7 And it came to pass after forty years, that Absalom said unto the king, I pray thee, let me go and pay my vow, which I have vowed unto the LORD, in Hebron.