JBABowl 3.1:3 :אומואי מומינא לך ואשבועי משבענא עלך דלא תיקטול ית הדין‏ : I absolutely exorcise you and absolutely adjure you that you may not kill this ... [and passim in this corpus as well as in parallel Syriac and Mandaic magic bowls]
See the entire entry for ymy vb. to swear