Happy are they who keep his unchanging word

Only take heart and be very strong; take care to do all the law which Moses my servant gave you, not turning from it to the right hand or to the left, so that you may do well in all your undertakings.
Josh 1:7 (BBE)

 Then Moses sent for Joshua, and before the eyes of all Israel said to him, Be strong and take heart: for you are to go with this people into the land which the Lord, by his oath to their fathers, has given them; by your help they will take it for their heritage.Deut 31:7 (BBE)

Take care, then, to do whatever the Lord your God has given you orders to do; let there be no turning away to the right hand or to the left. Deut 5:32 (BBE)

 You are to keep with care all the words I give you, making no addition to them and taking nothing from them.Deut 12:32


 So keep the words of this agreement and do them, so that it may be well for you in everything you do.Deut 29:9.

 And keep the orders of the Lord your God, walking in his ways, keeping his laws and his orders and his rules and his words, as they are recorded in the law of Moses; so that you may do well in all you do and wherever you go.1 Kings 2:3

 Happy are they who keep his unchanging word, searching after him with all their heart.
Psalms 119:2 (BBE)