Then you will succeed, if you carefully follow the statutes and ordinances that the LORD commanded Moses for Israel. Be strong and courageous. Do not be afraid or discouraged.
KJV
Then shalt thou prosper, if thou takest heed to fulfil the statutes and judgments which the LORD charged Moses with concerning Israel: be strong, and of good courage; dread not, nor be dismayed.
ASV
Then shalt thou prosper, if thou observe to do the statutes and the ordinances which Jehovah charged Moses with concerning Israel: be strong, and of good courage; fear not, neither be dismayed.