'The sons of Jonadab,' as in Jeremiah 35, represent people who are part of the celestial church of the Lord. That is why it is said that 'they should not drink wine, nor build a house, nor sow seed, nor plant vineyards,' which signifies learning and retaining truths of the memory, which constitute the spiritual church.

(References: The Inner Meaning of the Prophets and Psalms 101)