Gregory the Dialogist

ALLEGORICAL INTERPRETATION. And Satan answered the Lord, and said, Skin for skin; yea, all that a man hath will he give for his life. But put forth Thine hand now, and touch his bone and his flesh, and he will curse Thee to Thy face. When the evil spirit sees our Redeemer shine forth by miracles, he cries out, We know Who Thou art, the Holy One of God. And in saying this, he dreads, whilst he owns, the Son of God. …

Morals on the Book of Job, Book III ↗

Thomas Aquinas

Though repulsed, Satan does not rest, but still provides calumny wanting to show that every good which Job did, even the very fact that he had patiently tolerated his adversity, he had not done for the love of God, but for the health of his own body. So the text continues, "Then Satan answered the Lord: Skin for skin! All that man has he will give for his life." We must reflect that Job had been afflicted in two ways: the loss of his possessions and the loss of his children. …

Commentary on Job ↗