Musannaf Ibn Abi Shayba 26:487

Abu Usama narrated to us, from Husayn al-Mu‘allim, from ‘Amr ibn Shu‘ayb, from his father, from his grandfather, who said: Ri’ab ibn Hudhayfah ibn Sa‘id ibn Sahm married Umm Wa’il, the daughter of Ma‘mar al-Jumahiyyah, and she bore him three sons. Then their mother died, and her sons inherited her real estate and the patronage (wala’) of her freedmen. ‘Amr ibn al-‘As took them out to the Levant, and they died in the Plague of ‘Amwas. He said: So ‘Amr inherited them, for he was their agnate (asabah). When ‘Amr returned, the sons of Ma‘mar came and disputed with him before ‘Umar ibn al-Khattab regarding the patronage of their sister. ‘Umar said: "I will judge between you with what I heard from the Messenger of Allah (peace and blessings of Allah be upon him). I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: 'Whatever a child or a parent acquires, it belongs to his agnate, whoever he may be.'" He said: So he judged in our favor regarding it and wrote us a document containing the testimony of ‘Abd al-Rahman ibn ‘Awf, Zayd ibn Thabit, and another. Then, when ‘Abd al-Malik ibn Marwan became caliph, her freedman died and left two thousand dinars. It reached me that this judgment had been changed, so they disputed before Hisham ibn Isma‘il. We raised the matter to ‘Abd al-Malik and brought him the document of ‘Umar. He said: "I truly thought that this was among the judgments that were not to be doubted, and I did not think that the affair of the people of Medina had reached the point where they would doubt this judgment." So he judged in our favor regarding it, and we have remained in possession of it ever since.