Deuteronomy 11:21

19 Teach them to your children, speaking about them when you sit at home and when you walk along the road, when you lie down and when you get up.

20 Write them on the doorposts of your houses and on your gates,

so that as long as the heavens are above the earth, your days and those of your children may be multiplied in the land that the LORD swore to give your fathers.

22 For if you carefully keep all these commandments I am giving you to follow—to love the LORD your God, to walk in all His ways, and to hold fast to Him—

23 then the LORD will drive out all these nations before you, and you will dispossess nations greater and stronger than you.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
so that as long as the heavens are above the earth, your days and those of your children may be multiplied in the land that the LORD swore to give your fathers.
KJV
That your days may be multiplied, and the days of your children, in the land which the LORD sware unto your fathers to give them, as the days of heaven upon the earth.
WEB
that your days and your children’s days may be multiplied in the land which the LORD swore to your fathers to give them, as the days of the heavens above the earth.
ASV
that your days may be multiplied, and the days of your children, in the land which Jehovah sware unto your fathers to give them, as the days of the heavens above the earth.
DARBY
that your days may be multiplied, and the days of your children, in the land which Jehovah swore unto your fathers to give them, as the days of the heavens [which are] above the earth.
BLB
that your⁺ days may be multiplied—and the days of your⁺ children—in the land that YHWH swore to your⁺ fathers to give to them, as the days of the heavens are above the earth.
ÅB
for at deres og deres barns dager må bli mange i det land som Herren tilsvor deres fedre å ville gi dem, og dere må leve der like så lenge som himmelen hvelver seg over jorden.
OTB
så deres dager og deres barns dager kan bli mange i det landet Herren lovet å gi deres forfedre, så mange som dagene himmelen er over jorden.
B1930
forat eders og eders barns dager må bli mange i det land som Herren tilsvor eders fedre å ville gi dem, og I må leve der like så lenge som himmelen hvelver sig over jorden.

Study notes (Tyndale)

Original text and word study

Cross references