Gevurot Meyruach Hakodesh 19:11-12

And gevaltike moftim and niflaot Hashem effected at the hands of Rav Sha'ul, so that when a handkerchief or an apron touched the skin of Rav Sha'ul and was brought to the cholim, the machlot (sicknesses) and the shedim (demons) left them.