Deuteronomy 7:22

And Jehovah thy God will cast out those nations from before thee by little and little; thou shalt not be able to make an end of them at once, lest the beasts of the field increase upon thee.

Exodus 23:29-30

I will not drive them out from before thee in one year: lest the land become desolate, and the beast of the field multiply against thee.

Joshua 15:63

But as for the Jebusites, the inhabitants of Jerusalem, the children of Judah could not dispossess them; and the Jebusites dwell with the children of Judah at Jerusalem to this day.

Treasury of Scripture Knowledge

Summary

And the LORD thy God will put out those nations before thee by little and little: thou mayest not consume them at once, lest the beasts of the field increase upon thee.

General references

Bible References

Thou mayest

Exodus 23:29
I will not drive them out from before thee in one year: lest the land become desolate, and the beast of the field multiply against thee.
Joshua 15:63
But as for the Jebusites, the inhabitants of Jerusalem, the children of Judah could not dispossess them; and the Jebusites dwell with the children of Judah at Jerusalem to this day.

General references

Deuteronomy 11:23
then will Jehovah dispossess all these nations from before you, and ye shall take possession of nations greater and mightier than yourselves.
Joshua 21:44
And Jehovah gave them rest round about, according to all that he had sworn unto their fathers; and there stood not a man of all their enemies before them: Jehovah gave all their enemies into their hand.