Exodus 25:17-19

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

And thou shalt make two cherubim of gold; of beaten work shalt thou make them, at the two ends of the mercy-seat.

And make one cherub at the one end, and one cherub at the other end: of one piece with the mercy-seat shall ye make the cherubim on the two ends thereof.