'Rim' in the Bible

“And these are the measurements of the altar [of burnt offering] in cubits (the cubit being a [long] cubit [the length of a forearm] and a hand width): the base shall be a cubit [long] and a cubit wide, with its border on its edge all around it of a span [in width]. And this shall be the height of the base of the altar.

And you shall take some of its blood and put it on the four horns [of the altar of burnt offering] and on the four corners of the ledge and on the border all around; thus you shall cleanse it (from sin) and make atonement for it.