Deuteronomy 30:20

20 to love the LORD 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 the LORD swore to your fathers, to Avraham, to Yitzchak, and to Ya`akov, 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 denounce to you this day, that you shall surely perish; you shall not prolong your days in the land, where you pass over the Yarden to go in to possess it.
19 I call heaven and eretz to witness against you this day, that I have set before you life and death, the blessing and the curse: therefore choose life, that you may live, you and your seed;
20 to love the LORD 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 the LORD swore to your fathers, to Avraham, to Yitzchak, and to Ya`akov, to give them.
The Hebrew Names Version is in the public domain.