Numbers 28:16-19

And in the first month, on the fourteenth day of the month, is Jehovah’s passover. And on the fifteenth day of this month shall be a feast: seven days shall unleavened bread be eaten. In the first day shall be a holy convocation: ye shall do no servile work; but ye shall offer an offering made by fire, a burnt-offering unto Jehovah: two young bullocks, and one ram, and seven he-lambs a year old; they shall be unto you without blemish