Hadith #3860 (Sunan Abi Dawud)
Book: Medicine (Kitab Al-Tibb)
Narrator(s): Abu Hurairah, al-Rabi' bin Nafi' Abu Tawba al-Halbi الربيع بن نافع أبو توبة الحلبي, Sa'id bin 'Abdur Rahman bin 'Abdullah سعيد بن عبد الرحمن بن عبد الله بن حميل
Grade: Sahih

The Prophet (ﷺ) had himself cupped three times in the veins at the sides of the neck and on the shoulder. Ma’mar said: I got myself cupped, and I lost my memory so much so that I was instructed Surat al-Fatihah by others in my prayer. He had himself cupped at the top of his head.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-3860/