John Gill's Bible Commentary Ver. 9. Command Aaron and his sons , etc.] Who were nominated, selected, and appointed to the office, though not yet consecrated to it and invested with it, (see Leviticus 8:1) saying, this [is] the law of the burnt offering ; of the daily sacrifice, morning and evening: it [is] the burnt offering, because of, [or] for the burning upon the altar all night unto the morning ; as there was nothing offered on the altar of burnt offering after the evening daily sacrifice, nor anything before the morning daily sacrifice, it was the more difficult to keep the fire of the altar burning in the night; wherefore a slow fire was used in the evening sacrifice, and several things remained to be burnt in the night: so Maimonides says, the remainder of the fat of the members were burnt all night until the pillar of the morning (first rays of the rising sun, Editor.): and the fire of the altar shall be burning in it ; not without it, as Aben Ezra observes, but on it; that is, should be ever burning on it, night and day, as it is after declared.
Matthew Henry Commentary
Verses 8-13 - The daily sacrifice of a lamb is chiefly referred to. The priest mus take care of the fire upon the altar. The first fire upon the alta came from heaven, ch. 9:24; by keeping that up continually, all their sacrifices might be said to be consumed with the fire from heaven, i token of God's acceptance. Thus should the fire of our holy affections the exercise of our faith and love, of prayer and praise, be withou ceasing.
Original Hebrew צו6680 את853 אהרן175 ואת853 בניו1121 לאמר559 זאת2063 תורת8451 העלה5930 הוא1931 העלה5930 על5921 מוקדה4169 על5921 המזבח4196 כל3605 הלילה3915 עד5704 הבקר1242 ואשׁ784 המזבח4196 תוקד׃3344