Charles Ellicott Commentary Exodus 29:37

"Seven days thou shalt make atonement for the altar, and sanctify it: and the altar shall be most holy; whatsoever toucheth the altar shall be holy." — Exodus 29:37 (ASV)

An altar most holy. —Heb., an altar, holiness of holinesses.

Whatsoever toucheth the altar shall be holy. —Rather, must be holy; nothing which is not holy must touch it. The future has the force of an imperative, as in the Ten Commandments.