Numbers 28:3-4

28:3 You will say to them, ‘This is the offering made by fire which you must offer to the Lord: two unblemished lambs one year old each day for a continual ¹  burnt offering. 28:4 The first lamb you must offer in the morning, and the second lamb you must offer in the late afternoon, ² 

¹ sn The sacrifice was to be kept burning, but each morning the priests would have to clean the grill and put a new offering on the altar. So the idea of a continual burnt offering is more that of a regular offering.

² tn Heb “between the evenings” meaning between dusk and dark.