Khalid bin Mahran al-Hadha' خالد بن مهران الحذاء · The Book of al-'Aqiqah

"The Messenger of Allah offered an 'Aqiqah for Al-Hasan and Al-Husain, may Allah be please with them, two rams for each."

"Every boy is in pledge for his 'Aqiqah, so slaughter (the animal) for him on the seventh day, and shave his head, and a name"

"Muhammad bin Sirin said to me: 'Ask Al-Hasan (Al-Basri) from whom he heard this Hadith about the 'Aqiqah.' I asked him about that and he said: 'I heard it from Samurh."'