2 Samuel 5:4

5:4 David was thirty years old when he began to reign and he reigned for forty years.

2 Samuel 5:14-16

5:14 These are the names of children born to him in Jerusalem: Shammua, Shobab, Nathan, Solomon, 5:15 Ibhar, Elishua, Nepheg, Japhia, 5:16 Elishama, Eliada, and Eliphelet.