Ezekiel 13:4

(Versed 4 et sequentia) Your prophets, Israel, will be like foxes in the desert. You did not go up to face the enemy or build a wall for the house of Israel to stand firm in battle on the day of the Lord. They see false visions and speak deceptive divinations, saying, 'The Lord declares,' when the Lord has not sent them; yet they hope for the fulfillment of their words. Have you not seen a false vision and uttered a lying divination when you say, 'The Lord declares,' though I have not spoken?' LXX: Like foxes in the deserts are your prophets, O Israel ((Add. they were or will be)). They did not stand in the firmament, and they gathered flocks over the house of Israel. Those who say in the day of the Lord did not rise: seeing falsehoods, divining vanities, those who say, says the Lord, and the Lord did not send them: and they began to stir up discourse. Did you not see false visions, and speak vain divinations? And you said, says the Lord, and I did not speak. Let us first speak according to the Hebrew. The prophets of Israel are like foxes, committing thefts of domestic birds every day: those who live, according to Aquila and the Septuagint, in the deserts; according to Symmachus and Theodotion, in walls and ruins: who cannot advance opposite, nor oppose a wall for the house of Israel. We read that Aaron stood in the middle against the fire devouring the people of Israel, and opposed a wall for the salvation of the people (Num. XVI). It is also said of Jeremiah, 'Do not confront the Lord, nor stand against His wrath with persevering prayer' (Jer. 7). Just as a wall is set against an enemy and is usually met head-on by the adversary, so the will of God is weakened by the prayers of the saints. Therefore, Moses is also told, 'Let me alone, and I will destroy this people' (Exod. 32:10), which shows that he had the power to hold back. […]

At another time, because of his deceit toward his brother, he makes himself like the villainous fox. Truly, there is in him excessive folly and a bestial lack of reason, because, made according to the image of the Creator, he neither perceives his own constitution from the beginning nor wishes to understand such great dispensations that were made for his sake, so that he could learn his own dignity from them; he does not realize that, throwing aside the image of the heavenly, he has taken up the image of the earthly.

The fox is an animal good for nothing, sly, wild, ferocious.

O Israel, thy prophets are like the foxes of the deserts.

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.