1 Samuel 19:23

The book of Kings [Samuel] gives us an example about prophecy. Saul was the persecutor of David. When he was persecuting him, he sent guards to drag him away to punishment, and those who were sent to bring David to be slain found him among the prophets; and Samuel was there too.… So he had fled to the place where besides Samuel, the most distinguished of all the prophets, there were also many other prophets. Pushing their way among them, while they were prophesying, came the emissaries of Saul, to drag him off, as I said, to death. The spirit of God leaped upon them and they began to prophesy, having come to lead a holy and just man of God to the execution block and snatch him away from among the prophets. They were suddenly filled with the spirit of God and turned into prophets. It's possible this happened because of their innocence; after all, they hadn't come of their own accord to arrest him but had been sent by their king. And perhaps they had indeed come to the place where David was but weren't going to do what Saul had told them to; perhaps they too were intending to stay there. Because such things even happen today. Sometimes a bailiff is sent by high authority to drag somebody out of the church; he dare not act against God, and in order not to face execution himself he stays there, in the place he was sent, to haul someone out of it. So you could say, pleasantly surprised and relieved, that these men suddenly became prophets because they were innocent; the very gift of prophecy bore witness to their innocence. They came because they were sent, but they weren't going to do what that bad man had told them to. Let us believe that about them.Others were sent; the Spirit of God leaped on them too, and they too began to prophesy. Let's count them too with the first lot as being quite innocent. […]

For all who do not love God are strangers, are antichrists. And though they come to the churches, they cannot be numbered among the children of God. That fountain of life does not belong to them. To have baptism is possible even for a bad person; to prophesy is possible even for a bad person. We find that king Saul prophesied: he was persecuting holy David, yet he was filled with the spirit of prophecy and began to prophesy.

And the Spirit of the Lord also came upon him, etc. Indeed, the Jewish persecutor of the Church recognized that holy men of God, inspired by the Holy Spirit, spoke; but knowing how to utter their words with his mouth, yet not knowing how to …

And he went thither to Naioth in Ramah,.... He went on from the well towards the place: and the Spirit of God was upon him also; as well as upon his messengers; even the spirit of prophecy, as the Targum: and he went on and prophesied until he came to Naioth in Ramah: in this he differed from his messengers; they did not prophesy till they came to that place, but Saul began to prophesy before he came thither, as he was in his way from the well to it.

This was only amazing, but that sanctifying--this for a day, that for ever. Note, Many have great gifts and yet no grace, prophesy in Christ's name and yet are disowned by him, Matt. vii. Now the proverb recurs, Is Saul among the prophets?