Numbers 28:1

“Command the children of Israel, and tell them, ‘See that you present my offering, my food for my offerings made by fire, as a pleasant aroma to me, in their due season.’

You shall tell them, ‘This is the offering made by fire which you shall offer to the LORD: male lambs a year old without defect, two day by day, for a continual burnt offering.

You shall offer the one lamb in the morning, and you shall offer the other lamb at evening,