Deuteronomy 11:21

21 Then you and your children will live a long time in the land that the Lord your God promised to give to your ancestors. You will live there as long as there is a sky above the earth.

Deuteronomy 11:21 Meaning and Commentary

Deuteronomy 11:21

That your days may be multiplied
Long life being a very desirable blessing, and which is promised to those that obey and keep the law; see ( Deuteronomy 30:19 Deuteronomy 30:20 ) ( Psalms 91:16 )

and the days of your children;
which are dear to parents, and the continuance of whose lives, next to their own, is most desirable, yea, as desirable as their own; and especially it is desirable that they might have a posterity descending from them, to enjoy for ever their estates and possessions; as it was to the people of Israel, that they might have a seed always to dwell

in the land which the Lord sware unto your fathers to give them;
the land of Canaan, so often spoken of as the promise, oath, and gift of God:

as the days of heaven upon the earth;
that is, as long as the heavens and the earth shall be, and the one shall be over the other, as they will be to the end of time.

Deuteronomy 11:21 In-Context

19 Teach them to your children. Talk about them when you are at home and when you are away, when you are resting and when you are working.
20 Write them on the doorposts of your houses and on your gates.
21 Then you and your children will live a long time in the land that the Lord your God promised to give to your ancestors. You will live there as long as there is a sky above the earth.
22 "Obey faithfully everything that I have commanded you: Love the Lord your God, do everything he commands, and be faithful to him.
23 Then he will drive out all those nations as you advance, and you will occupy the land belonging to nations greater and more powerful than you.
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.