Joshua 22:5 & James 1:25

Joshua 22:5 

Only be very careful to observe the commandment and the law that Moses the servant of the Lord commanded you, to love the Lord your God, and to walk in all his ways and to keep his commandments and to cling to him and to serve him with all your heart and with all your soul.” 

James 1:25 

But the one who looks into the perfect law, the law of liberty, and perseveres, being no hearer who forgets but a doer who acts, he will be blessed in his doing.