Deuteronomy 30:20

30:20 to love Yahweh your God, to obey his voice, and to cleave to him; for he is your life, and the length of your days; that you may dwell in the land which Yahweh swore to your fathers, to Abraham, to Isaac, and to Jacob, to give them.
-World English Bible

Other Translation

30:20 That thou mayest love the LORD thy God, [and] that thou mayest obey his voice, and that thou mayest cleave unto him: for he [is] thy life, and the length of thy days: that thou mayest dwell in the land which the LORD sware unto thy fathers, to Abraham, to Isaac, and to Jacob, to give them.
-King James Version