New International Version
so that your days and the days of your children may be many in the land the LORD swore to give your ancestors, as many as the days that the heavens are above the earth.

American Standard Version
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.

Berean Study Bible
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.

Douay-Rheims Bible
That thy days may be multiplied, and the days of thy children in the land which the Lord swore to thy fathers, that he would give them as long as the heaven hangeth over the earth.

English Revised Version
that your days may be multiplied, and the days of your children, upon the land which the LORD sware unto your fathers to give them, as the days of the heavens above the earth.

King James Bible
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.

World English Bible
that your days may be multiplied, and the days of your children, in the land which Yahweh swore to your fathers to give them, as the days of the heavens above the earth.

Young's Literal Translation
so that your days are multiplied, and the days of your sons, on the ground which Jehovah hath sworn to your fathers to give to them, as the days of the heavens on the earth.

Deuteronomy 11:21 Additional Translations ...