Deuteronomy 30:20

20 that thou may love the LORD thy God and that thou may hear his voice and that thou may cleave unto him; for he is thy life and the length of thy days that thou may dwell in the land which the LORD swore unto thy fathers, to Abraham to Isaac and to Jacob, to give them.

Deuteronomy 30:20 Meaning and Commentary

Deuteronomy 30:20

That thou mayest love the Lord thy God
And show it by keeping his commands:

[and] that thou mayest obey his voice;
in his word, and by his prophets:

and that thou mayest cleave unto him;
and to his worship, and not follow after and serve other gods:

for he [is] thy life, and the length of thy days;
the God of their lives, and the Father of their mercies; the giver of long life, and all the blessings of it; and which he had promised to those that were obedient, to him, and which they might expect:

that thou mayest dwell in the land which the Lord sware unto thy
fathers, to Abraham, to Isaac, and to Jacob, to give them;
the land of Canaan, often thus described; this was the grand promise made to obedience to the law, and was typical of eternal life and happiness; which is had, not through man's obedience to the law, but through the obedience and righteousness of Christ.

Deuteronomy 30:20 In-Context

18 I declare unto you this day that ye shall surely perish and that ye shall not prolong your days upon the land, to go unto which thou passest the Jordan to inherit it.
19 I call the heavens and the earth to witness today against you that I have set before you life and death, blessing and cursing; therefore, choose life that both thou and thy seed may live,
20 that thou may love the LORD thy God and that thou may hear his voice and that thou may cleave unto him; for he is thy life and the length of thy days that thou may dwell in the land which the LORD swore unto thy fathers, to Abraham to Isaac and to Jacob, to give them.
The Jubilee Bible (from the Scriptures of the Reformation), edited by Russell M. Stendal, Copyright © 2000, 2001, 2010