26 – Abu Hatim narrated to me; Muhammad ibn Musa al-Jurashi narrated to us, from Hammad ibn Zayd ⦗57⦘, from ʿUbayd Allah ibn ʿUmar, who said: ʿUmar ibn al-Khattab said to his son, “Does the greyness in your hair not deter you from disobeying Allah?”