Deuteronomy 7:2 Kabbalah

וּנְתָנָ֞ם יְהוָ֧ה אֱלֹהֶ֛יךָ לְפָנֶ֖יךָ וְהִכִּיתָ֑ם הַחֲרֵ֤ם תַּחֲרִים֙ אֹתָ֔ם לֹא־תִכְרֹ֥ת לָהֶ֛ם בְּרִ֖ית וְלֹ֥א תְחָנֵּֽם׃

and when the LORD thy God shall deliver them up before thee, and thou shalt smite them; then thou shalt utterly destroy them; thou shalt make no covenant with them, nor show mercy unto them;

Read kabbalistic (mystical) interpretation of Deuteronomy 7:2: and classical mystical sources.