Musannaf Ibn Abi Shayba 20:10

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sufyan, from Abu Qays, from Hudhayl ibn Shurahbil, who said: A man came to Abu Musa and Salman ibn Rabi’ah and asked them about a daughter, a son’s daughter, and a sister (full sister). They said: "For the daughter is half, and whatever remains is for the sister. Go to Ibn Mas’ud and ask him, for he will agree with us." The man went to Ibn Mas’ud and asked him, and informed him of what they had said. Ibn Mas’ud said: "I would have gone astray then, and I would not be among the guided. Rather, I will judge as the Messenger of Allah (peace and blessings of Allah be upon him) judged: for the daughter is half, and for the son’s daughter is one-sixth, to complete the two-thirds, and whatever remains is for the sister."