תלמוד על שופטים 1:16

Rabbi Yehoshua ben Levi said: When I know that the Temple is going to be built again between the territories of Judah and Benjamin, I will go and prepare the fields of Jericho. And who ate the produce of those fields during all those years? The Kenites, the descendants of Moses’ father-in-law, as says (Judges 1:16), “And the Kenites, the descendants of Moses’ father-in-law, went up from the City of Palms.”
He also said: When the Holy Blessed One removed His Presence, He promised to give a great reward in the future to Jethro and his descendants. [How do we know] that the descendants of Jethro were supported from charity in the meantime? Because of what it says (I Chronicles 2:55), “The families of the tribes that dwelled at Jabez,” and then (I Chronicles 4:23), “They were the potters, who dwelled in the plantations.” (They were great men, owners of houses, fields, and vineyards. And because of the work of the King of all kings, the Holy Blessed One, they dwelled there) in the king’s service. So then where did they go? They went to Jabez to study Torah, and there they became a people of God. (At that time) Jabez was a good and righteous man, a man of truth and piety, and he would sit and teach Torah, as it says (I Chronicles 4:10), “And Jabez called out to the God of Israel, saying [if You bless me…and God granted his request].”