Muhammad bin 'Ubaid al-Tanafasi محمد بن عبيد بن أبي أمية الطنافسي · The Book of Marriage

It was narrated that 'Alqamah said: "I was with Ibn Mas'ud while he was with 'Uthman, may Allah be pleased with him, and 'Uthman said: 'The Messenger of Allah came out to some fityah (young men)--Abu 'AbdurRahman said, 'I did not understand (the word) fityah as I would want'-- and said: 'Whoever among you can afford it, let him get married, for it is more effective in lowering the gaze and guarding chastity, and whoever cannot, then fasting will be…

"I read a book to Ash-Sha'bi in which it was narrated from Jabir that the Prophet said: 'A woman should not be taken as a co-wife to her paternal aunt or her maternal aunt.' He said: 'I heard that from Jabir.'"