Leviticus 6:9

6:9 “Command Aaron and his sons, ‘This is the law of the burnt offering. The burnt offering is to remain on the hearth ¹  on the altar all night until morning, and the fire of the altar must be kept burning on it. ² 

Leviticus 6:13

6:13 A continual fire must be kept burning on the altar. It must not be extinguished.

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¹ tn Heb “It is the burnt offering on the hearth.”

² tn Heb “in it.” In this context “in it” apparently refers to the “hearth” which was on top of the altar.