Exodus 25:17

25:17 “You are to make an atonement lid of pure gold; its length is to be three feet nine inches, and its width is to be two feet three inches.

Hebrews 9:5

9:5 And above the ark were the cherubim of glory overshadowing the mercy seat. Now is not the time to speak of these things in detail.

Hebrews 9:8

9:8 The Holy Spirit is making clear that the way into the holy place had not yet appeared as long as the old tabernacle was standing.