וּנְתָנָ֛ם יְהוָ֥ה אֱלֹהֶ֖יךָ לְפָנֶ֑יךָ וְהָמָם֙ מְהוּמָ֣ה גְדֹלָ֔ה עַ֖ד הִשָּׁמְדָֽם׃
But the LORD thy God shall deliver them up before thee, and shall discomfit them with a great discomfiture, until they be destroyed.
Read kabbalistic (mystical) interpretation of Deuteronomy 7:23: and classical mystical sources.