הַדָּבָ֗ר אֲשֶׁ֨ר דִּבֶּ֧ר יְהוָ֛ה אֶל־בָּבֶ֖ל אֶל־אֶ֣רֶץ כַּשְׂדִּ֑ים בְּיַ֖ד יִרְמְיָ֥הוּ הַנָּבִֽיא׃
The word that the LORD spoke concerning Babylon, concerning the land of the Chaldeans, by Jeremiah the prophet.
Read halakhic rulings (Jewish law) on Jeremiah 50:1: and classical halakhic sources.