Exodus 29:37

³⁵And thus shalt thou do for Aaron and for his sons according to all things that I have commanded thee; seven days shalt thou fill their hands.

³⁶And thou shalt sacrifice the calf of the sin offering on the day of purification, and thou shalt purify the altar when thou dost perform consecration upon it, and thou shalt anoint it so as to sanctify it.

— Exodus 29:37 —

³⁸And these are the offerings which thou shalt offer upon the altar; two unblemished lambs of a year old daily on the altar continually, a constant offering.

³⁹One lamb thou shalt offer in the morning, and the second lamb thou shalt offer in the evening.