Exodus 16:34

16:34 Just as the Lord commanded Moses, so Aaron placed it before the Testimony for safekeeping.

Exodus 26:33-34

26:33 You are to hang this curtain under the clasps and bring the ark of the testimony in there behind the curtain. The curtain will make a division for you between the Holy Place and the Most Holy Place. 26:34 You are to put the atonement lid on the ark of the testimony in the Most Holy Place.

Exodus 32:15

32:15 Moses turned and went down from the mountain with the two tablets of the testimony in his hands. The tablets were written on both sides – they were written on the front and on the back.