Verses 1–8
EXODUS - CHAPTER TWENTY-SEVEN
Verses 1-8:
"An altar," lit. "the altar;" this was the altar which God earlier instructed to be built, see Ex 20:24. It was to be made of acacia (shittim) wood, overlaid with copper (brass). This was a change in the provision God had earlier made, requiring His altars to be made of earth, or unhewn stones, Ex 20:25.
Protruding from the top of each corner of the altar were "horns," in appearance like the horns of a bull. These were features unique to Israel’s altars. A criminal might cling to the altar horns when seeking sanctuary, as in 1 Kings 1:50; 2:28. The priest smeared the blood of the sin-offering upon the horns, Ex 24:12; Le 8:15; 9:9; 16:18; et. al. The horns symbolized power, protection, and help, and also glory and salvation.
The altar was to be four-square, five cubits (7 1/2 feet) each side, and three cubits (4 1/4 feet) high. It was to be hollow. Suspended inside the altar at mid-point was a grating of copper.
"Compass," karkob, "circuit, or margin." The significance of this is uncertain. Some expositors say it was a kind of bench or step, upon which the priest stood while officiating at the altar. Others hold it was ornamentation which projected slightly and upon which the rings were affixed for the grating to be suspended.
Rings were affixed to the sides of the altar. Wooden staves overlaid with copper (brass) were inserted into these rings, to enable the altar to be carried.