Exodus 37:4-6

Young's Literal Translation

⁴ and he maketh staves of shittim wood, and overlayeth them with gold,

⁵ and he bringeth in the staves into the rings, by the sides of the ark, to bear the ark.

⁶ And he maketh a mercy-seat of pure gold, two cubits and a half its length, and a cubit and a half its breadth;