It is narrated from Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever has himself cauterised or seeks ruqyah has not relied (upon Allah)."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 18016