Exodus 37:6

And he made a mercy seat of pure gold . Two cubits and a half was its length , and a cubit and a half its breadth .

He made the atonement cover of pure gold—two and a half cubits long and a cubit and a half wide.

And he made the mercy seat of pure gold : two cubits and a half was the length thereof, and one cubit and a half the breadth thereof.