Narrated Anas ibn Malik:
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.
حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا جَرِيرٌ، – يَعْنِي ابْنَ حَازِمٍ – حَدَّثَنَا قَتَادَةُ، عَنْ أَنَسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم احْتَجَمَ ثَلاَثًا فِي الأَخْدَعَيْنِ وَالْكَاهِلِ . قَالَ مَعْمَرٌ احْتَجَمْتُ فَذَهَبَ عَقْلِي حَتَّى كُنْتُ أُلَقَّنُ فَاتِحَةَ الْكِتَابِ فِي صَلاَتِي . وَكَانَ احْتَجَمَ عَلَى هَامَتِهِ .
Reference : Sunan Abu Dawud 3860
In-book reference : Book 29, Hadith 6
English translation : Book 28, Hadith 3851