וְהֵבֵאתִ֨י עֲלֵיכֶ֜ם חֶ֗רֶב נֹקֶ֙מֶת֙ נְקַם־בְּרִ֔ית וְנֶאֱסַפְתֶּ֖ם אֶל־עָרֵיכֶ֑ם וְשִׁלַּ֤חְתִּי דֶ֙בֶר֙ בְּת֣וֹכְכֶ֔ם וְנִתַּתֶּ֖ם בְּיַד־אוֹיֵֽב׃
And I will bring a sword upon you, that shall execute the vengeance of the covenant; and ye shall be gathered together within your cities; and I will send the pestilence among you; and ye shall be delivered into the hand of the enemy.
Read halakhic rulings (Jewish law) on Leviticus 26:25: and classical halakhic sources.