Cross reference
Exodus 39:35
35 The ark of the law, with its rods and its cover;
Exodus 25:17
17 And you are to make a cover of the best gold, two and a half cubits long and a cubit and a half wide.
Hebrews 9:5
5 And over it were the winged ones of glory with their wings covering the mercy-seat; about which it is not possible now to say anything in detail.
Hebrews 9:8
8 The Holy Spirit witnessing by this that the way into the holy place had not at that time been made open, while the first Tent was still in being;