Saul was [forty] years old when he began to reign; and when he had reigned two years over Israel,
Referenced Verses
Exod 12:5 : 5 Your lamb shall be without blemish, a male a year old: ye shall take it from the sheep, or from the goats:
Mic 6:6 : 6 Wherewith shall I come before Jehovah, and bow myself before the high God? shall I come before him with burnt-offerings, with calves a year old?