Al-Kāfi

Hadith 1642
marriagechastity
1- الْحُسَيْنُ بْنُ مُحَمَّدٍ عَنْ مُعَلَّى بْنِ مُحَمَّدٍ عَنِ الْحَسَنِ بْنِ عَلِيٍّ عَنْ حَمَّادِ بْنِ عُثْمَانَ قَالَ قُلْتُ لأبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) رَجُلٌ أَتَى غُلاماً أَتَحِلُّ لَهُ أُخْتُهُ قَالَ فَقَالَ إِنْ كَانَ ثَقَبَ فَلا.
1. Al-Husayn b. Muhammad has narrated from Mu’allah b. Muhammad from al-Hasan b. Ali from Hammad b. Uthman who said: I asked Abi Abdillah (as): "A man who commits a sinful act with a boy, is his sister lawful for him (to marry)?' He (the Imam) said, 'If he made a hole, then no."
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī