Jezekiel 43:17

17 And the mercy-seat fourteen cubits in length, by fourteen cubits in breadth on its four sides; and a border to it carried round about it of half a cubit; and the rim of it a cubit round about; and the steps thereof looking eastward.

Jezekiel 43:17 In-Context

15 And the altar four cubits; and from the altar and above the horns a cubit.
16 And the altar of the length of twelve cubits, by twelve cubits , square upon its four sides.
17 And the mercy-seat fourteen cubits in length, by fourteen cubits in breadth on its four sides; and a border to it carried round about it of half a cubit; and the rim of it a cubit round about; and the steps thereof looking eastward.
18 And he said to me, Son of man, thus saith the Lord God of Israel; These are the ordinances of the altar in the day of its being made, to offer upon it whole-burnt-offerings, and to pour blood upon it.
19 And thou shalt appoint to the priests the Levites of the seed of Sadduc, that draw nigh to me, saith the Lord God, to minister to me, a calf of the herd for a sin-offering.

The Brenton translation of the Septuagint is in the public domain.