Exodus 25:16

25:16 You are to put into the ark the testimony ¹  that I will give to you.

Exodus 30:26

30:26 “With it you are to anoint the tent of meeting, the ark of the testimony,

Exodus 35:12

35:12 the ark, with its poles, the atonement lid, and the special curtain that conceals it;

Exodus 39:35

39:35 the ark of the testimony and its poles, and the atonement lid;

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¹ sn The “testimony” is the Decalogue (Exod 24:12; 31:18; Deut 4:13; 9:9; 1 Kgs 8:9); the word identifies it as the witness or affirmation of God’s commandments belonging to his covenant with Israel. It expressed God’s will and man’s duty. In other cultures important documents were put at the feet of the gods in the temples.