Deuteronomy 4:40
you shall keep therefore his statutes, and his commandments, which I command you this day, that it may go well with you, and with your children after you, and that you mayest prolong days upon the earth, which the Yahuah your Elohim giveth you, for ever.
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Context
38 To drive out nations from before you greater and mightier than you , to bring you in, to give you their land an inheritance, as this day.
39 Know therefore this day, and consider in your heart, that the Yahuah he Elohim in heaven above, and upon the earth beneath: none else.
40 you shall keep therefore his statutes, and his commandments, which I command you this day, that it may go well with you, and with your children after you, and that you mayest prolong days upon the earth, which the Yahuah your Elohim giveth you, for ever.
41 Then Moses severed three cities on this side Jordan toward the sunrising;
42 That the slayer might flee thither, which should kill his neighbour unawares, and hated him not in times past; and that fleeing unto one of these cities he might live: