יַדְבֵּ֧ק יְהוָ֛ה בְּךָ֖ אֶת־הַדָּ֑בֶר עַ֚ד כַּלֹּת֣וֹ אֹֽתְךָ֔ מֵעַל֙ הָֽאֲדָמָ֔ה אֲשֶׁר־אַתָּ֥ה בָא־שָׁ֖מָּה לְרִשְׁתָּֽהּ׃
L’Éternel attachera à tes flancs la peste, jusqu’à ce qu’elle t’ait consumé de dessus la terre où tu vas entrer pour en prendre possession.
Mishnah Ta'anit
And so too a city which has a plague or [its buildings] collapse that city fasts and they sound a blast, but those [in the places] around it fast but do not sound the alarm. Rabbi Akiva says: they sound the alarm but do not fast. What constitutes a plague? If in a city that can supply five hundred foot-soldiers and three deaths occurred on three consecutive days, behold this constitutes a plague, less than this is not a plague.