Numbers 28:16-19

‘On the fourteenth day of the first month is the Passover of the LORD. And on the fifteenth day of this month is the feast; unleavened bread shall be eaten for seven days. On the first day you shall have a holy convocation. You shall do no customary work. And you shall present an offering made by fire as a burnt offering to the LORD: two young bulls, one ram, and seven lambs in their first year. Be sure they are without blemish.