Deuteronomy 6:25

And it shall be our righteousness, if we observe to do all these commandments before the LORD our God, as he hath commanded us.

And it shall be our righteousness, if we observe to do all these commandments. Every Israelite who yielded an external obedience to the Mosaic law was termed righteous, and had a claim, in virtue of that obedience, to the land of Canaan; so that doing these things, he lived by them (Leviticus 18:5; Deuteronomy 5:33). The import of the statement in these verses, then, is, that a faithful observance of "all these commandments" should constitute their title to the promised blessings of the covenant.