Deuteronomy
Deuteronomy ("repetition of the Law") serves as a reminder to God's people about His covenant. The book is a "pause" before Joshua's conquest begins and a reminder of what God required.
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But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things,
and bring all things to your remembrance, whatsoever I have said unto you. John 14:26