And the Lord thy God will put out those nations before thee by little and little,.... Which is observed for their encouragement, who seeing that all were not destroyed at once, might fear the work would never be thoroughly accomplished; see Exo 23:30, thou mayest not consume them at once; though it was in the power of their hands to do it, there being some wise reasons for sparing them awhile, at least for not cutting them off all at once, and one follows: lest the beasts of the field increase upon thee; through so many places being waste without inhabitants, and there being none to destroy these creatures; and who therefore in course would become more numerous, and so more troublesome and distressing to the Israelites. The Targum of Jonathan adds, by way of explanation,"when they shall come to devour their carcasses,''the carcasses of the slain Canaanites; who, if destroyed at once, would be so many, that they would lie unburied, which would invite the beasts of the field to come out of their lurking places to feed upon them, and which might lead them on to mischief among the Israelites.