this is what the LORD of Hosts, the God of Israel, says: Jonadab son of Rechab will never fail to have a man to stand before Me.’”
So then God now, in order to excite and rouse the Jews, promises to bless the Rechabites, because they had been obedient to their father, There shall not be cut off a man from Jonadab, that is, from the offspring of Jonadab, standing (literally) before my face; but as the conciseness of the verse renders it obscure and ambiguous, I have introduced an addition, —...
The trial of the Rechabites' constancy was intended but for a sign; now here we have the application of it. I. The Rechabites' observance of their father's charge to them is made use of as an aggravation of the disobedience of the Jews to God. Let them see it and be ashamed. The prophet asks them, in God's name, "Will you not at length receive instruction? Jer 35:13.
Commenting on Jeremiah 35:12-19
Therefore thus saith the Lord of hosts, the God of Israel,.... Who has enjoined children obedience to their parents, and has promised to reward it, and does: Jonadab the son of Rechab shall not want a man to stand before me for ever; which may be understood of a long time, of ages to come; or as long as the people of the Jews were...