לֹ֤א הֶאֱמִ֙ינוּ֙ מַלְכֵי־אֶ֔רֶץ וכל [כֹּ֖ל] יֹשְׁבֵ֣י תֵבֵ֑ל כִּ֤י יָבֹא֙ צַ֣ר וְאוֹיֵ֔ב בְּשַׁעֲרֵ֖י יְרוּשָׁלִָֽם׃ (ס)
The kings of the earth believed not, Neither all the inhabitants of the world, That the adversary and the enemy would enter Into the gates of Jerusalem.
Read halakhic rulings (Jewish law) on Lamentations 4:12: and classical halakhic sources.