Adam Clarke on Ezekiel 43:15

So the altar - ההראל haharel, "the mount of God."

And from the altar - ומהאראיל umihaariel, "and from the lion of God." Perhaps the first was a name given to the altar when elevated to the honor of God, and on which the victims were offered to him, and the second, the lion of God, may mean the hearth, which might have been thus called, because it devoured and consumed the burnt-offerings, as a lion does his prey. See on Isa 29:1 (note).