Exodus 25:16-18

Young's Literal Translation

¹⁶ and thou hast put unto the ark the testimony which I give unto thee.

¹⁷ `And thou hast made a mercy-seat of pure gold, two cubits and a half its length, and a cubit and a half its breadth;

¹⁸ and thou hast made two cherubs of gold, beaten work dost thou make them, at the two ends of the mercy-seat;