וְאָמַרְתָּ֣ אֲלֵיהֶ֗ם זֶ֤ה הַגּוֹי֙ אֲשֶׁ֣ר לֽוֹא־שָׁמְע֗וּ בְּקוֹל֙ יְהוָ֣ה אֱלֹהָ֔יו וְלֹ֥א לָקְח֖וּ מוּסָ֑ר אָֽבְדָה֙ הָֽאֱמוּנָ֔ה וְנִכְרְתָ֖ה מִפִּיהֶֽם׃ (ס)
Therefore thou shalt say unto them: This is the nation that hath not hearkened To the voice of the LORD their God, Nor received correction; Faithfulness is perished, And is cut off from their mouth.
Read halakhic rulings (Jewish law) on Jeremiah 7:28: and classical halakhic sources.