It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that Sayyiduna Umar (may Allah be pleased with him) wrote in a letter to Sayyiduna Abu Ubaidah bin Al-Jarrah (may Allah be pleased with him) that teach your sons swimming and your warriors archery. Thus, they began to learn archery by targeting various things. In this context, an unknown arrow struck a child, causing his death. He had only one heir, and that was his maternal uncle. Sayyiduna Abu Ubaidah bin Al-Jarrah (may Allah be pleased with him) wrote to Sayyiduna Umar (may Allah be pleased with him) regarding this matter. He replied in writing that the Prophet (peace and blessings of Allah be upon him) said: "Whoever has no mawla, Allah and His Messenger are his mawla, and whoever has no heir, his maternal uncle will be his heir."