Deuteronomy 30:20

20 love the Lord your God, obey Him, and remain faithful[a] to Him. For He is your life, and He will prolong your life in the land the Lord swore to give to your fathers Abraham, Isaac, and Jacob."

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 tell you today that you will certainly perish and will not live long in the land you are entering to possess across the Jordan.
19 I call heaven and earth as witnesses against you today that I have set before you life and death, blessing and curse. Choose life so that you and your descendants may live,
20 love the Lord your God, obey Him, and remain faithful to Him. For He is your life, and He will prolong your life in the land the Lord swore to give to your fathers Abraham, Isaac, and Jacob."

Footnotes 1

Holman Christian Standard Bible ® Copyright © 2003, 2002, 2000, 1999 by Holman Bible Publishers.  Used by permission.  All rights reserved.