Deuteronomy 7:20

20 `And also the locust doth Jehovah thy God send among them, till the destruction of those who are left, and of those who are hidden from thy presence;

Deuteronomy 7:20 Meaning and Commentary

Deuteronomy 7:20

Moreover, the Lord thy God will send the hornet among them,
&c.] Not a single one, but several of them, and which may be understood of creatures so called, which resemble wasps, only twice as large, an insect very bold and venomous; see ( Exodus 23:28 ) . Aben Ezra interprets it of the leprosy:

until they that are left, and hide themselves from thee, be destroyed;
such of the Canaanites who escaped the sword of the Israelites, and hid themselves in holes and caverns of the earth; these the hornets would find out and sting them to death, until they were all destroyed. Thus God can make use of small creatures, even insects, to destroy nations the most populous and mighty.

Deuteronomy 7:20 In-Context

18 thou art not afraid of them; thou dost surely remember that which Jehovah thy God hath done to Pharaoh, and to all Egypt,
19 the great trials which thine eyes have seen, and the signs, and the wonders, and the strong hand, and the stretched-out arm, with which Jehovah thy God hath brought thee out; so doth Jehovah thy God to all the peoples of whose presence thou art afraid.
20 `And also the locust doth Jehovah thy God send among them, till the destruction of those who are left, and of those who are hidden from thy presence;
21 thou art not terrified by their presence, for Jehovah thy God [is] in thy midst, a God great and fearful.
22 `And Jehovah thy God hath cast out these nations from thy presence little [by] little, (thou art not able to consume them hastily, lest the beast of the field multiply against thee),
Young's Literal Translation is in the public domain.