Deuteronomy 31:9

Moses is the writer of those five books which bear his name; but it should seem, that over and above the sacred volume of these five books, he wrote the law to deposit in the ark separately: laying it up in the ark, not only for its security, and to imply its sacredness, but it carried with it this also, that in JESUS, which that ark typified, the whole law is kept and completed. He saith himself; by his type David, thy law is within my heart; or as it might have been read, in the midst of my bowels, meaning part of himself. Psalms 40:8.