1 Samuel 19:20

20 so he sent men to capture him. But when they saw a group of prophets prophesying, with Samuel standing there as their leader, the Spirit of God came on Saul’s men, and they also prophesied.

Read 1 Samuel 19:20 Using Other Translations

And Saul sent messengers to take David: and when they saw the company of the prophets prophesying, and Samuel standing as appointed over them, the Spirit of God was upon the messengers of Saul, and they also prophesied.
Then Saul sent messengers to take David, and when they saw the company of the prophets prophesying, and Samuel standing as head over them, the Spirit of God came upon the messengers of Saul, and they also prophesied.
he sent troops to capture him. But when they arrived and saw Samuel leading a group of prophets who were prophesying, the Spirit of God came upon Saul’s men, and they also began to prophesy.

What does 1 Samuel 19:20 mean?

John Gill's Exposition of the Bible
1 Samuel 19:20

And Saul sent messengers to take David
Notwithstanding the sacred place he was in, so bent was he upon his destruction:

and when they saw the company of the prophets prophesying;
or praising, as the Targum; singing hymns and songs of praise to God, under the inspiration and influence of the Spirit of God, who endited these songs for them, and excited them to sing them; these prophets belonged to the school or college of prophets at Naioth, whom the messengers saw when they came thither, and found them thus employed; or "when he saw" F13, for the word is singular, that is, the chief of the messengers, or everyone of them, so Kimchi:

and Samuel standing [as] appointed over them;
he was president of the college, and he stood to instruct and teach them in the knowledge of divine things: so the Targum,

``standing, teaching over them or by them,''

and to direct and assist them in singing their songs of praise:

the Spirit of the Lord was upon the messengers of Saul, and they also
prophesied:
or praised, as the Targum; sung hymns and songs of praise as the prophets did, and were so taken up with these religious exercises, that they forgot, or were inattentive to the business they were sent to do. Ben Gersom thinks they foretold things to come, and so Abarbinel; and particularly that they prophesied that David should rule over all Israel, and that God would not suffer Saul to slay him; and so were indifferent to, and negligent of doing the errand they were sent on, yea, purposely avoided it.


FOOTNOTES:

F13 (aryw) "et vidit", Montanus, Vatablus, Tigurine version; "et vidit quisque [vel] unusquisque illorum", Junius & Tremellius, Piscator.
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