Umar's retaliation for the Egyptian against Amr ibn al-As's son

Ibn Abd al-Hakam reports from Abu Abda, from Thabit al-Bunani and Humayd, from Anas, that a man of Egypt came to Umar ibn al-Khattab seeking refuge from injustice: he had raced the son of Amr ibn al-As and won, and the son had whipped him, saying, "I am the son of the noblest." ¹

Umar wrote to Amr to come to him with his son. When they arrived, Umar told the Egyptian to take the whip and strike. He struck, and Anas says they wished he would stop before he did. Umar then told him to lay it on Amr as well; the Egyptian said it was the son who had beaten him and he had had his due. ¹ Umar said to Amr: "Since when have you enslaved people, when their mothers bore them free?" Amr said he had not known of it and it had not been brought to him. ²

The report is preceded in the book by an address of Umar saying that he had not sent his governors to flog people or seize their property and that he would grant retaliation against them; Amr asked whether that applied to a governor who disciplined one of his subjects, and Umar said yes, for he had seen the Prophet ﷺ give retaliation against himself. ^{3 1}