1 Saul was [thirty] years old when he began to reign; and he reigned two years over Israel.
1 Samuel 13:1 Cross References - ERV
Exodus 12:5
5 Your lamb shall be without blemish, a male of the first year: ye shall take it from the sheep, or from the goats:
Micah 6:6
6 Wherewith shall I come before the LORD, and bow myself before the high God? shall I come before him with burnt offerings, with calves of a year old?