13:1-9 Where God gives a warrant to do any thing, he gives wisdom. What they delivered was not what they had seen or heard, as that is which the ministers of Christ deliver. They were not praying prophets, had no intercourse with Heaven; they contrived how to please people, not how to do them good; they stood not against sin. They flattered people into vain hopes. Such widen the breach, by causing men to think themselves deserving of eternal life, when the wrath of God abides upon them.

4. foxes—which cunningly "spoil the vines" (So 2:15), Israel being the vineyard (Ps 80:8-15; Isa 5:1-7; 27:2; Jer 2:21); their duty was to have guarded it from being spoiled, whereas they themselves spoiled it by corruptions.

in … deserts—where there is nothing to eat; whence the foxes become so ravenous and crafty in their devices to get food. So the prophets wander in Israel, a moral desert, unrestrained, greedy of gain which they get by craft.