Deuteronomy 4:40

40 Thou shalt keep therefore his statutes and his commandments which I command thee this day, that it may be well with thee, and with thy children after thee, and that thou mayest prolong [thy] days upon the earth, which the LORD thy God giveth thee, for ever.

Deuteronomy 4:40 In-Context

38 To drive out nations from before thee, greater and mightier than thou [art], to bring thee in, to give thee their land [for] an inheritance, as [it is] this day.
39 Know therefore this day, and consider [it] in thy heart, that the LORD he [is] God in heaven above, and upon the earth beneath: [there is] none else.
40 Thou shalt keep therefore his statutes and his commandments which I command thee this day, that it may be well with thee, and with thy children after thee, and that thou mayest prolong [thy] days upon the earth, which the LORD thy God giveth thee, for ever.
41 Then Moses set apart three cities on the side of Jordan, towards the sun-rising;
42 That the slayer might flee thither, who should kill his neighbor unawares, and when he had not hated him in times past; and that fleeing to one of these cities he might live:
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