Exodus 25:16-22

Then put in the Ark the Agreement which I will make with you. “Then make a lid of pure gold for the Ark; this is the mercy seat. Make it forty-five inches long and twenty-seven inches wide. Then hammer gold to make two creatures with wings, and put one on each end of the lid. Attach one creature on one end of the lid and the other creature on the other end. Make them to be one piece with the lid at the ends. The creatures’ wings should be spread upward, covering the lid, and the creatures are to face each other across the lid. Put this lid on top of the Ark, and put in the Ark the Agreement which I will make with you. I will meet with you there, above the lid between the two winged creatures on the Ark of the Agreement. There I will give you all my commands for the Israelites.