Joshua 1:8

That thou mayst clearly understand all that thou art to do, the book of the Law must never be out of thy mouth. Thou must study it day and night, that thou mayst know how to do all that are written. Then shalt thou be prospered; and thou wilt make thy ways prosperous; and then thou shalt have a good understanding.

And the book of this law shall not depart out of thy mouth, and thou shalt meditate in it day and night, that thou mayest know how to do all the things that are written in it; then shalt thou prosper, and make thy ways prosperous, and then shalt thou be wise.