Abu Kabsha al-Anmari told that God’s messenger had himself cupped on the top of his head because of the poisoned sheep.* Ma'mar said:I had myself cupped like that in the middle of my head for a reason other than poison and suffered some loss of memory till I was recommended to use Fatihat al-Kitab in the prayer. Razin transmitted it. * An attempt was made to poison the Prophet after the conquest of Khaibar in 7 A.H., but when he had taken a mouthful of the poisoned meat he spat it out realizing that it was poisoned.
Hadith Referenceمشكوة المصابيح / كتاب الطب والرقى / 4572
Hadith Gradingالألبانی:لم تتمّ دراسته | زبیر علی زئی:لم أجده
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «لم أجده، رواه رزين (لم أجده) [و لم أجده في مصنف عبد الرزاق]»