Deuteronomy 30:20

20 in loving Jehovah thy God, in hearkening to his voice, and in cleaving to him -- for this is thy life and the length of thy days -- that thou mayest dwell in the land which Jehovah 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 denounce unto you this day that ye shall surely perish; ye shall not prolong your days upon the land whereunto thou passest over the Jordan to possess it.
19 I call heaven and earth to witness this day against you: life and death have I set before you, blessing and cursing: choose then life, that thou mayest live, thou and thy seed,
20 in loving Jehovah thy God, in hearkening to his voice, and in cleaving to him -- for this is thy life and the length of thy days -- that thou mayest dwell in the land which Jehovah swore unto thy fathers, to Abraham, to Isaac, and to Jacob, to give them.
The Darby Translation is in the public domain.