Ver. 3. Neither shalt thou make marriages with them— The reason is added in the following verse, because there was a danger, if they loved their wives, that they might be drawn over to their idolatry. On the same account the apostle warns Christians against such unequal matches. 2 Corinthians 6:14. From this verse it is justly inferred, that the Canaanites might be spared, upon their repentance and reformation from idolatry; for there could be no occasion for this injunction, if it be supposed that nothing which breathed was to be saved alive, but all were utterly to be destroyed. What end could it serve, to forbid intermarriages with a people supposed not at all to be? See Dr. Sykes as above.
Related Commentaries of Deuteronomy 7:3
Deuteronomy 7:3
3 Neither shalt thou make marriages with them; thy daughter thou shalt not give unto his son, nor his daughter shalt thou take unto thy son.