English translation
646. Sa'eed bin Abī Sa'eed Al-Maqburī narrated from his father, that he saw Abū Rāfī', the freed-slave of the Prophet ﷺ, pass by Hasan bin 'Alī, peace be upon them, while he was standing in prayer. He (Hasan) had tucked his braid into the back of his head. Abū Rāfī' undid it, so Hasan turned to him angrily. Abū Rāfī' said: "Turn back to your prayer and do not be angry, for I heard the Messenger of Allāh ﷺ say: 'That is the place of Shaitān,'" meaning that the place where the braid was tucked was the place that Shaitān sits on. (Ḥasan)
