Hadith record

3. Ali ibn Ibrahim has narrated from his father or from Muhammad ibn Ali from Musa ibn Sa‘dan from certain persons of his people who have said the following: “Once I was with abu ‘Abd Allah (a.s.), when a man came and said, ‘I pray to Allah to keep my soul in service for your cause, if two young men slept together and one has a son and the other has a daughter; if his son could marry the other man’s daughter.’ He (the narrator) has said that he (the Imam) said, ‘Yes, Allah is free of all defects, why can it be unlawful?’ The man said they were friends. He (the Imam) said, ‘Even if such is the case it is not unlawful.’ The man said, ‘He was doing to him.’ He (the Imam) turned away his face then, while covering his face with his arms, said, ‘Even if it was what it was without doing the hole it is not unlawful to marry but if awqaba (made a hole in him) then marriage is not lawful.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.