New Revised Standard Version
and so that you may live long in the land that the LORD swore to your ancestors to give them and to their descendants, a land flowing with milk and honey.

Contemporary English Version
that the LORD promised your ancestors and their descendants. It's rich with milk and honey, and you will live there and enjoy it for a long time.

New American Bible
and that you may have long life on the land which the LORD swore to your ancestors he would give to them and their descendants, a land flowing with milk and honey.

Douay-Rheims Bible
And may live in it a long time: which the Lord promised by oath to your fathers, and to their seed, a land which floweth with milk and honey.

And may live in it a long time: which the Lord promised by oath to your fathers, and to their seed, a land which floweth with milk and honey.

prolong

Deuteronomy 4:40 Keep his precepts and commandments, which I command thee: that it may be well with thee, and thy children after thee, and thou mayst remain a long time upon the land, which the Lord thy God will give thee.

Deuteronomy 5:16 Honour thy father and mother, as the Lord thy God hath commanded thee, that thou mayst live a long time, and it may be well with thee in the land, which the Lord thy God will give thee.

Deuteronomy 6:2 That thou mayst fear the Lord thy God, and keep all his commandments and precepts, which I command thee, and thy sons, and thy grandsons, all the days of thy life, that thy days may be prolonged.

Psalm 34:12 Who is the man that desireth life: who liveth to see good days?

Proverbs 3:2,16 Let not mercy aud truth leave thee, put them about thy neck, and write them in the tables of thy heart. . . .

Proverbs 9:11 If thou be wise, thou shalt be so to thyself: and if a scorner, thou alone shalt bear the evil.

Proverbs 10:27 The expectation of the just is joy: but the hope of the wicked shall perish.

sware

Deuteronomy 6:18 And do that which is pleasing and good in the sight of the Lord, that it may be well with thee: and going in thou mayst possess the goodly land, concerning which the Lord swore to thy fathers,

Deuteronomy 9:5 For it is not for thy justices, and the uprightness of thy heart that thou shalt go in to possess their lands: but because they have done wickedly, they are destroyed at thy coming in: and that the Lord might accomplish his word, which he promised by oath to thy fathers Abraham, Isaac, and Jacob.

a land

Exodus 3:8 And knowing their sorrow, I am come down to deliver them out of the hands of the Egyptians, and to bring them out of that land into a good and spacious land, into a land that floweth with milk and honey, to the places of the Chanaanite, and Hethite, and Amorrhite, and Pherezite, and Hevite, and Jebusite.

Ezekiel 20:6 In that day I lifted up my hand for them to bring them out of the land of Egypt, into a land which I had provided for them, flowing with milk and honey, which excelled amongst all lands.