Musannaf Ibn Abi Shaybah 25839 — On which day the aqiqah

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that he said concerning the aqiqah: It is to be slaughtered on the child's behalf on the seventh day, the child's head is to be shaved, the weight of his hair in silver is to be given in charity, and his head is to be smeared with the blood.