1 Samuel 19:21

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. […]

And when it was told Saul,.... That the messengers he had sent, instead of seizing on David, were prophesying of him, or however were attending to services of a different nature than what they were sent upon: he sent other messengers, and they prophesied likewise; when they came to the same place: and Saul sent messengers again a third time, and they prophesied also; joined the rest in singing praises, or foretelling future events.

And Jonathan brought David to Saul, and he was in his presence, as in times past. Saul and Jonathan appear here in their different characters, with reference to David. Never was enemy so unreasonably cruel as Saul.

It was a retreat congenial to the mind of David; but Saul, having found out his asylum, sent three successive bodies of men to apprehend him. The character of the place and the influence of the sacred exercises produced such an effect on them that they were incapable of discharging their commission, and were led, by a resistless impulse, to join in singing the praises of God.