R. Nathan says: Great is the covenant that was made with Yonadav the son of Rechav than that made with David. For that made with David was conditional, viz. (Psalms 132:12) "If your sons keep My covenant, etc.", and if not, (Ibid. 89:33) "then I will punish their offense with the rod," but the covenant with Yonadav the son of Rechav was unconditional, viz. (Jeremiah 35:19) "There will not be cut off a man of (the descendants of) Yonadav the son of Rechav standing before Me all of the days."...