“And he found the jaw-bone of an ass.” It is to be observed that, after [Samson had committed] fornication, the holy Scripture no longer speaks of the things happily accomplished by him in connection with the formula, “The Spirit of the Lord came upon him.” For thus, according to the holy apostle, the sin of fornication is perpetrated against the body, as involving also sin against the temple of God.
Source: Fragments from the Lost Writings of Irenaeus (New Advent)