Deuteronomy 9:5

5 Not for thy righteousness, or for the uprightness of thy heart, dost thou enter in to possess their land, but for the wickedness of these nations doth Jehovah thy God dispossess them from before thee, and that he may perform the word which Jehovah swore unto thy fathers, to Abraham, to Isaac, and to Jacob.

Deuteronomy 9:5 Meaning and Commentary

Deuteronomy 9:5

Not for thy righteousness, or for the uprightness of thine
heart
Neither for their external righteousness before men, or their outward conformity to the law, nor for the inward sincerity of their hearts, and their upright intentions in doing good, in which they were defective:

dost thou go to possess their land;
this is repeated, and enlarged on, and explained, that this notion might be entirely removed from them, and not entertained by them; similar to which is that of men, who fancy that their sincere obedience, though imperfect, will be accepted of God instead of a perfect one, on account of which they shall be justified and saved; but by the deeds of the law no flesh living can be justified in the sight of God, nor by any works of righteousness done by the best of men, and in the best manner they are capable of, will any be saved;

but for the wickedness of those nations the Lord thy God doth drive
them out from before thee;
which is repeated, that it might be taken notice of as the true reason of the Lord's dealing with them in such severity; and which because it would be now doing, when the Israelites passed over Jordan, and went in to possess the land, it is expressed in the present tense, "doth drive", the work being not yet finished; sin was the cause of their ejection out of their land, and another thing was the reason of the Israelites possessing it, and not their righteousness next expressed:

and that he may perform the word which the Lord sware unto thy fathers,
Abraham, Isaac, and Jacob;
it was to fulfil his covenant, and make good his word of promise to their fathers, and not on account of any righteousness of theirs; and the salvation of the Lord's people in a spiritual sense, and their enjoyment of the heavenly Canaan, are owing to the gracious purposes and promises of God, and to his covenant engagements, as well as to the undertakings, obedience, and righteousness of his Son, and not to any righteousness of theirs.

Deuteronomy 9:5 In-Context

3 Know then this day, that Jehovah thy God is he that goeth over before thee, a consuming fire; he will destroy them, and he will cast them down before thee, and thou shalt dispossess them and cause them to perish quickly, as Jehovah hath said unto thee.

4 Thou shalt not say in thy heart, when Jehovah thy God thrusteth them out from before thee, saying, For my righteousness Jehovah hath brought me in to possess this land; but for the wickedness of these nations doth Jehovah dispossess them from before thee.

5 Not for thy righteousness, or for the uprightness of thy heart, dost thou enter in to possess their land, but for the wickedness of these nations doth Jehovah thy God dispossess them from before thee, and that he may perform the word which Jehovah swore unto thy fathers, to Abraham, to Isaac, and to Jacob.

6 Know therefore that Jehovah thy God doth not give thee this good land to possess it for thy righteousness; for thou art a stiff-necked people.

7 Remember, forget not, how thou provokedst Jehovah thy God to wrath in the wilderness. From the day that thou didst depart out of the land of Egypt, until ye came to this place, ye have been rebellious against Jehovah.