Take heed to thyself
This is said not to Moses, but to the people of Israel, as a caution to them when they should enter the land of Canaan, and possess it:
lest thou make a covenant with the inhabitants of the land
enter into a league and alliance, to live friendly and amicably, and support and assist each other against the common enemy; whereas they were to smite the seven nations and destroy them, and show them no mercy, ( Deuteronomy 7:1 Deuteronomy 7:2 )
lest it be for a snare in the midst of thee;
be the means of drawing them into the same sinful practices with themselves, especially into idolatrous ones, and so of bringing ruin and destruction on them.