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. The company of the prophets prophesying - Employed in religious exercises.
Samuel - appointed over them - Being head or president of the school at this place.
The Spirit of God was upon the messengers - They partook of the same influence, and joined in the same exercise; and thus were prevented from seizing David.