Deuteronomy 9:5

5 For not for thy rightwiseness, and for the equity of thine heart thou shalt enter, that thou wield their land; but for they did wickedly, they were done away (by thy Lord God), when thou enteredest, and that the Lord should [ful]fill his word which he promised under an oath to thy fathers, to Abraham, Isaac, and Jacob. (For it is not because of thy own righteousness, or the integrity of thy own heart, that thou shalt enter to take their land; but they shall be done away before thee by the Lord thy God, because they did wickedly, and so that the Lord would fulfill his word which he promised under an oath to thy fathers, to Abraham, Isaac, and 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 Therefore thou shalt know today that thy Lord God himself shall pass before thee; he is a fire devouring and wasting, that shall all-break them, and he shall do them away, and destroy them before thy face swiftly, as he spake to thee. (And so know thou today that the Lord thy God himself shall go ahead of thee; he is a devouring and wasting fire, and he shall all-break them before thy face, and then ye shall do them away, and swiftly destroy them, as he promised thee.)

4 Say thou not in thine heart, when thy Lord God hath done them away in thy sight, For my rightwiseness the Lord hath brought me in hither, that I should wield the land; since these nations be done away for their wickednesses. (But when the Lord thy God hath done them away before thee, do not thou say in thy heart, Because of my righteousness, the Lord hath brought me here, so that I could take this land; since these nations shall be done away because of their own wickednesses.)

5 For not for thy rightwiseness, and for the equity of thine heart thou shalt enter, that thou wield their land; but for they did wickedly, they were done away (by thy Lord God), when thou enteredest, and that the Lord should [ful]fill his word which he promised under an oath to thy fathers, to Abraham, Isaac, and Jacob. (For it is not because of thy own righteousness, or the integrity of thy own heart, that thou shalt enter to take their land; but they shall be done away before thee by the Lord thy God, because they did wickedly, and so that the Lord would fulfill his word which he promised under an oath to thy fathers, to Abraham, Isaac, and Jacob.)

6 Therefore know thou that not for thy rightwisenesses thy Lord God hath given to thee this best land into possession, since thou art a people of most hard noll. (And so know thou that the Lord thy God hath not given thee this best land for a possession because of thy own righteousness, since thou art a most stubborn, or a stiff-necked, people.)

7 Have thou (in) mind, and forget not (Remember, and do not forget), how in the wilderness thou stirredest thy Lord God to great wrath; (and) from that day in which thou wentest out of Egypt till to this place, thou hast striven ever[more] against the Lord.