Leviticus 6:9

Command Aaron and his sons, saying, This is the law of the burnt offering: It is the burnt offering, because of the burning upon the altar all night unto the morning, and the fire of the altar shall be burning in it. All the paragraphs following contain special instructions for the priests with regard to the various offerings. The first paragraph relates to the daily burnt offering of a lamb at evening and in the morning, which was made at the cost of the entire congregation. Cf Exodus 29:38; Numbers 28:3. "The slow fire of the evening sacrifice was to be so arranged as to last until the morning; that of the morning sacrifice was ordinarily added to by other offerings, or if not, could easily be made to last through the much shorter interval until the evening. The evening sacrifice is naturally mentioned first because, in the Hebrew division of time, this was the beginning of the day. "