Deuteronomy 4:40

Thou shalt keep, therefore, His statutes and His commandments which I command thee this day, both those pertaining to them, concerning them, as men, and those having reference to them as the covenant people, that it may go well with thee, since they would have Jehovah on their side, and with thy children after thee, and that thou mayest prolong thy days upon the earth which the Lord, thy God, giveth thee, forever; for a long and happy life, accompanied by the goodness of the Lord, is a blessing. We Christians also know the precepts of the Lord's holy will and should live in accordance with them. If we are always mindful of the fact that God has redeemed us from the kingdom of darkness and translated us into the kingdom of His dear Son, we shall also be ready to serve Him in true obedience, to do according to His commandments.