'Altar's' in the Bible

The ledge is 24½ feet long by 24½ feet wide, with four equal sides. The rim all around it is 10½ inches, and its gutter is 21 inches all around it. The altar’s steps face east.”

The priest must take some of the blood from the sin offering and apply it to the temple doorposts, the four corners of the altar’s ledge, and the doorposts of the gate to the inner court.