גַּם־בָּבֶ֕ל לִנְפֹּ֖ל חַֽלְלֵ֣י יִשְׂרָאֵ֑ל גַּם־לְבָבֶ֥ל נָפְל֖וּ חַֽלְלֵ֥י כָל־הָאָֽרֶץ׃
As Babylon hath caused the slain of Israel to fall, So at Babylon shall fall the slain of all the land.
Read halakhic rulings (Jewish law) on Jeremiah 51:49: and classical halakhic sources.