Jezekiel 43:14

14 from the bottom at the commencement of the hollow part to this great mercy-seat, from beneath was two cubits, and the breadth was a cubit; and from the little mercy-seat to the great mercy-seat, four cubits, and the breadth was a cubit.

Jezekiel 43:14 In-Context

12 And thou shalt shew the plan of the house on the top of the mountain: all its limits round about most holy.
13 And these are the measures of the altar by the cubit of a cubit and a span, the cavity a cubit deep, and a cubit shall be the breadth, and the border on the rim of it round about shall be a span: and this the height of the altar
14 from the bottom at the commencement of the hollow part to this great mercy-seat, from beneath was two cubits, and the breadth was a cubit; and from the little mercy-seat to the great mercy-seat, four cubits, and the breadth was a cubit.
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.

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