Exodus 29:35-37

Verse 36

Thou shalt cleanse the altar - The altar was to be sanctified for seven days; and it is likely that on each day, previously to the consecration service, the altar was wiped clean, and the former day's ashes, etc., removed.
Verse 37

Whatsoever touches the altar shall be holy - To this our Lord refers Mat 23:19, where he says the altar sanctifies the gift; and this may be understood as implying that whatever was laid on the altar became the Lord's property, and must be wholly devoted to sacred uses, for in no other sense could such things be sanctified by touching the altar.
Copyright information for Clarke