Abu Dawud
Medicine
Book Number: 022 / Hadith Number: 3874
Narated By Abdullah ibn Mas'ud : Zaynab, the wife of Abdullah ibn Mas'ud, told that Abdullah said: I heard the Apostle of Allah (pbuh) saying: spells, charms and love-potions are polytheism.
I asked: Why do you say this? I swear by Allah, when my eye was discharging I used to go to so-and-so, the Jew, who applied a spell to me. When he applied the spell to me, it calmed down. Abdullah said:
That was just the work of the Devil who was picking it with his hand, and when he uttered the spell on it, he desisted. All you need to do is to say as the Apostle of Allah (pbuh) used to say: Remove the harm, O Lord of men, and heal. Thou art the Healer. There is no remedy but Thine which leaves no disease behind.