Solomon reigned in # 11_1KI_11_42 # And the time that Solomon reigned in Jerusalem over all Israel [was] forty years. 
Solomon reigned in # 11_1KI_14_21 # And Rehoboam the son of Solomon reigned in Judah. Rehoboam [was] forty and one years old when he began to reign, and he reigned seventeen years in Jerusalem, the city which the LORD did choose out of all the tribes of Israel, to put his name there. And his mother's name [was] Naamah an Ammonitess. 
Solomon reigned in # 14_2CH_09_30 # And Solomon reigned in Jerusalem over all Israel forty years.