Sayyiduna Abu Umamah bin Sahl (may Allah be pleased with him) narrates: Sayyiduna Umar (may Allah be pleased with him) wrote a letter to Sayyiduna Ubaidah (may Allah be pleased with him) instructing him to teach swimming to his children and archery to his warriors. The narrator states: Those people were practicing this at various places when suddenly a stray arrow came and struck a boy, and that boy died. Among the boy’s relatives, only his maternal uncle was found. Sayyiduna Abu Ubaidah (may Allah be pleased with him) wrote a letter to Sayyiduna Umar (may Allah be pleased with him) and described the matter of the boy, asking to whom the blood money should be entrusted. Sayyiduna Umar (may Allah be pleased with him) wrote back to him that the Noble Prophet (peace and blessings be upon him) has said:“Whoever has no mawla (patron), Allah and His Messenger are his mawla, and whoever has no heir, his maternal uncle is his heir.”