Deuteronomy 31:24-26

Young's Literal Translation

²⁴ And it cometh to pass, when Moses finisheth to write the words of this law on a book till their completion,

²⁵ that Moses commandeth the Levites bearing the ark of the covenant of Jehovah, saying,

²⁶ `Take this Book of the Law, and thou hast set it on the side of the ark of the covenant of Jehovah your God, and it hath been there against thee for a witness;