ייִדישער מחשבֿה אויף ירמיהו 35:19

Thus send the dwellers of the land of Israel, who abide by the Torah of Moses, [which is] a gift and inherited portion, to our brothers - the children of Israel, the son of Isaaq the son of Abraham who revealed the belief in Hashem - they are our holy and pure brothers, the righteous upon whom the world rests - the Bnei Moshe, servant of Hashem - who dwell across the river Shevatyon also known as Sambatyon, and who pledge allegiance to the king – the King of Israel – who sits upon a mighty throne and who rules over the Ten Tribes, whose settlement is in the land of beyond the rivers of Nubia (Kush), who camp according to their banners, the tribe of Dan, of Naftali, of Gad and Asher, the tribe of Issachar who understand the movements of the celestial bodies – constantly involved in Torah study - and the tribe of Zebulun encamped at Mt. Friyan(?), and across them: the tribe of Reuven, of Efrayim and Menashe, and the tribe of Shimon, may Hashem be with them...and their King...and to our honored brothers, the children of Israel: the upright and righteous sons of Jehonadav the son of Rekhav, upon whom the prophet Jeremiah prophesied, “Therefore said Hashem Z-vaot G-d of Israel, no male offspring of Jonadav ben Rekhav will ever be cut off from standing before me for eternity.”

Among them: The matter of the sons of Yonadav ben Rechav whose father commanded them to never drink wine, nor sow, nor plant a vineyard, nor build a house, that they dwell in tents, outside settled places. This is the custom of those who separate themselves from the world. The Creator praised them for this as written: "Therefore Yonadav the son of Rechab shall not lack a man [descendant] to stand before Me forever" (Yirmiya 35:19).