al-Hasan al-Basri الحسن البصري · Sacrifice (Kitab Al-Dahaya)

The Messenger of Allah (ﷺ) said: Two sheep which resemble each other are to be sacrificed for a boy and one for a girl. Abu Dawud said: This is a sound tradition, and the tradition narrated by Sufyan is misunderstanding.

The Prophet (ﷺ) said: A boy is in pledge for his Aqiqah. Sacrifice is made for him on the seventh day, his head is shaved and is smeared with blood. When Qatadah was asked about smearing with blood, how that should be done, he said: When you cut the head (i.e. throat) of the animal (meant for Aqiqah), you may take a few hair of it, place them on its veins, and then place them in the middle of the…

The Messenger of Allah (ﷺ) as saying: Along with a boy there is an 'Aqiqah, so shed blood on his behalf, and remove injury from him.