גָּזִּ֤י נִזְרֵךְ֙ וְֽהַשְׁלִ֔יכִי וּשְׂאִ֥י עַל־שְׁפָיִ֖ם קִינָ֑ה כִּ֚י מָאַ֣ס יְהוָ֔ה וַיִּטֹּ֖שׁ אֶת־דּ֥וֹר עֶבְרָתֽוֹ׃
Cut off thy hair, and cast it away, And take up a lamentation on the high hills; For the LORD hath rejected and forsaken the generation of His wrath.
Read halakhic rulings (Jewish law) on Jeremiah 7:29: and classical halakhic sources.