Exodus 27:8

“Hollow with boards shalt thou make it, etc.] The frame of it being made of boards of shittim wood, there was nothing within side but the grate, which was put within the square, down into the middle of it, and so was light of carriage; though the Targum of Jonathan, and other Jewish writers, represent this hollow as filled up with dust and earth, to answer to the altar of earth Moses was before bid to make; but this seems quite contrary to the present direction: the hollowness of the altar may denote the emptiness of Christ when he became a sacrifice: he emptied himself, as it were, when he became incarnate, of all his greatness, glory, and riches, and became mean and poor for the sake of his…”

“(Compare Exodus 38:1-7.) The great altar which stood in the court immediately in front of the tabernacle was commonly called the altar of burnt-offering, because on it were burnt the whole burnt-offerings, and all those parts of the other animal sacrifices which were offered to the Lord. It was also called the brazen altar, because it was covered with bronze, in distinction from the golden altar or altar of incense Exodus 39:38-39; Exodus 40:5-6. Exodus 27:2 His horns shall be of the same - These horns were projections pointing upward in the form either of a small obelisk, or of the horn of an ox. They were to be actually parts of the altar, not merely superadded to it. On them the blood of…”

“as it was showed: Heb. he shewed, Exo 25:9, Exo 25:40, Exo 26:30-37; Ch1 28:11, Ch1 28:19; Mat 15:9; Col 2:20-23; Heb 8:5 Exodus 27:9”