Wahb bin Jarir bin Hazim bin Zayd وهب بن جرير بن حازم بن زيد · The Book on Sacrifices

That the Messenger of Allah (ﷺ) said: "The boy is mortgaged by his 'Aqiqah; slaughtering should be done for him on the seventh day, he should be given a name, and his head should be shaved."