Thy prophets are like the foxes in the deserts - The cunning of the fox in obtaining his prey has been long proverbial. These false prophets are represented as the foxes who, having got their prey by great subtlety, run to the desert to hide both themselves and it. So the false prophets, when the event did not answer to their prediction, got out of the way, that they might not be overwhelmed with the reproaches and indignation of the people.
In the deserts - Foxes find a home among ruins etc. Lamentations 5:18. So the prophets find their profit in the ruin of their country.