The Prophet of Allah ﷺ used to say, "Every boy is held in pledge by his aqiqah, which is to be slaughtered on the seventh day, and his head is to be shaved, and he is to be smeared with the blood."
حدثنا عفان حدثنا همام حدثنا قتادة عن الحسن
أن نبي الله ﷺ كان يقول كل غلام رهينة لعقيقته تذبح يوم سابعه ويحلق ويدمى