כֹּ֤ה אָמַר֙ יְהוָ֣ה צְבָא֔וֹת הִנְנִי֙ מְשַׁלֵּ֣חַ בָּ֔ם אֶת־הַחֶ֖רֶב אֶת־הָרָעָ֣ב וְאֶת־הַדָּ֑בֶר וְנָתַתִּ֣י אוֹתָ֗ם כַּתְּאֵנִים֙ הַשֹּׁ֣עָרִ֔ים אֲשֶׁ֥ר לֹא־תֵאָכַ֖לְנָה מֵרֹֽעַ׃
thus saith the LORD of hosts: Behold, I will send upon them the sword, the famine, and the pestilence, and will make them like vile figs, that cannot be eaten, they are so bad.
Read midrashic interpretation of Jeremiah 29:17: and classical rabbinic exegesis.