About being careful to obey:

These are the commands, decrees and laws the Lord your God directed me to teach you to observe in the land that you are crossing the Jordan to possess, � so that you, your children and their children after them may fear the Lord your God as long as you live by keeping all his decrees and commands that I give you, and so that you may enjoy long life.� Hear, O Israel, and be careful to obey so that it may go well with you and that you may increase greatly in a land flowing with milk and honey, just as the Lord, the God of your fathers, promised you. � Hear, O Israel: The Lord our God, the Lord is one. � Be sure to keep the commands of the Lord your God and the stipulations and decrees he has given you. � Do what is right and good in the Lord's sight, so that it may go well with you and you may go in and take over the good land that the Lord promised on oath to your forefathers, � thrusting out all your enemies before you, as the Lord said. � Before our eyes the Lord sent miraculous signs and wonders--great and terrible--upon Egypt and Pharaoh and his whole household. � But he brought us out from there to bring us in and give us the land that he promised on oath to our forefathers. � The Lord commanded us to obey all these decrees and to fear the Lord our God, so that we might always prosper and be kept alive, as is the case today.

Verse References In The Order Presented Above -- Deut. 6:1 ; Deuteronomy 6:2 ; Deuteronomy 6:3 ; Deuteronomy 6:4 ; Deuteronomy 6:17 ; Deuteronomy 6:18 ; Deuteronomy 6:19 ; Deuteronomy 6:22 ; Deuteronomy 6:23 ; Deuteronomy 6:24