"Now this is what you shall offer on the altar: two lambs of the first year, day by day continually.
Exodus 29:38
Surrounding context
29:37 Seven days you shall make atonement for the altar and sanctify it. And the altar shall be most holy. Whatever touches the altar must be holy.
29:38 "Now this is what you shall offer on the altar: two lambs of the first year, day by day continually.
29:39 One lamb you shall offer in the morning, and the other lamb you shall offer at twilight.