Joshua 1:7-8

7Only be thou strong and very courageous, that thou mayest observe to do according to all the law, which Moses my servant commanded thee: turn not from it to the right hand or to the left, that thou mayest prosper wherever thou goest.1

8This book of the law shall not depart out of thy mouth; but thou shalt meditate in it day and night, that thou mayest observe to do according to all that is written in it: for then thou shalt make thy way prosperous, and then thou shalt have good success.2