Exodus 25:15LXX

13And thou shalt make staves shittim wood, and overlay them with gold.

14And thou shalt put the staves into the rings by the sides of the ark, that the ark may be borne with them.

15The staves shall be in the rings of the ark: they shall not be taken from it.

16And thou shalt put into the ark the testimony which I shall give thee.

17And thou shalt make a mercy seat pure gold: two cubits and a half the length thereof, and a cubit and a half the breadth thereof.