וַיִּשְׁלַ֨ח שָׁא֣וּל מַלְאָכִים֮ לָקַ֣חַת אֶת־דָּוִד֒ וַיַּ֗רְא אֶֽת־לַהֲקַ֤ת הַנְּבִיאִים֙ נִבְּאִ֔ים וּשְׁמוּאֵ֕ל עֹמֵ֥ד נִצָּ֖ב עֲלֵיהֶ֑ם וַתְּהִ֞י עַֽל־מַלְאֲכֵ֤י שָׁאוּל֙ ר֣וּחַ אֱלֹהִ֔ים וַיִּֽתְנַבְּא֖וּ גַּם־הֵֽמָּה׃
And 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.
Read halakhic rulings (Jewish law) on I Samuel 19:20 from the Mishneh Torah and classical halakhic sources, free online.