New Revised Standard Version
It is not because of your righteousness or the uprightness of your heart that you are going in to occupy their land; but because of the wickedness of these nations the LORD your God is dispossessing them before you, in order to fulfill the promise that the LORD made on oath to your ancestors, to Abraham, to Isaac, and to Jacob.

New American Bible
No, it is not because of your justice or the integrity of your heart that you are going in to take possession of their land; but it is because of their wickedness that the LORD, your God, is dispossessing these nations before you and in order to fulfill the promise he made on oath to your ancestors, Abraham, Isaac, and Jacob.

Douay-Rheims Bible
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.

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.

Not for

Titus 3:5 Not by the works of justice which we have done, but according to his mercy, he saved us, by the laver of regeneration and renovation of the Holy Ghost.

that he may

Genesis 12:7 And the Lord appeared to Abram, and said to him: To thy seed will I give this land. And he built there an altar to the Lord, who had appeared to him.

Genesis 13:15 All the land which thou seest, I will give to thee, and to thy seed for ever.

Genesis 15:7 And he said to him: I am the Lord who brought thee out from Ur of the Chaldees, to give thee this land, and that thou mightest possess it.

Genesis 17:8 And I will give to thee, and to thy seed, the land of thy sojournment, all the land of Chanaan, for a perpetual possession, and I will be their God.

Genesis 26:4 And I will multiply thy seed like the stars of heaven: and I will give to thy posterity all these countries: and in thy seed shall all the nations of the earth be blessed.

Genesis 28:13 And the Lord leaning upon the ladder saying to him: I am the Lord God of Abraham thy father, and the God of Isaac: The land, wherein thou sleepest, I will give to thee and to thy seed.

Exodus 32:13 Remember Abraham, Isaac, and Israel, thy servants, to whom thou sworest by thy own self, saying: I will multiply your seed as the stars of heaven: and this whole land that I have spoken of, I will give to your seed, and you shall possess it for ever:

Ezekiel 20:14 But I spared them for the sake of my name, lest it should be profaned before the nations, from which I brought them out, in their sight.

Luke 1:54,55 He hath received Israel his servant, being mindful of his mercy. . . .

Acts 3:25 You are the children of the prophets and of the testament which God made to our fathers, saying to Abraham: And in thy seed shall all the kindreds of the earth be blessed.

Acts 13:32 And we declare unto you that the promise which was made to our fathers,

Romans 11:28 As concerning the gospel, indeed, they are enemies for your sake: but as touching the election, they are most dear for the sake of the fathers.

Romans 15:8 For I say that Christ Jesus was minister of the circumcision for the truth of God, to confirm the promises made unto the fathers: