כִּ֣י הֵקִ֗ימוּ בְּנֵי֙ יְהוֹנָדָ֣ב בֶּן־רֵכָ֔ב אֶת־מִצְוַ֥ת אֲבִיהֶ֖ם אֲשֶׁ֣ר צִוָּ֑ם וְהָעָ֣ם הַזֶּ֔ה לֹ֥א שָׁמְע֖וּ אֵלָֽי׃ (ס)
Because the sons of Jonadab the son of Rechab have performed the commandment of their father which he commanded them, but this people hath not hearkened unto Me;
Read kabbalistic (mystical) interpretation of Jeremiah 35:16: and classical mystical sources.