Musannaf Ibn Abi Shayba 16:8

Abu Bakr narrated to us, he said: Muhammad ibn Bishr narrated to us, from Sa'id, from Qatadah, from al-Hasan, from Samurah, from the Messenger of Allah (may Allah bless him and grant him peace), who said: "The boy is held in pledge by his 'aqiqah; it is slaughtered on his behalf."