Al-Kāfi

Hadith 251
divorcewitnesses
مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ إِسْمَاعِيلَ بْنِ بَزِيعٍ عَنْ مُحَمَّدِ بْنِ الْفُضَيْلِ عَنْ أَبِي الصَّبَّاحِ الْكِنَانِيِّ عَنْ أَبِي عَبْدِ اللَّهِ ( عليه السلام ) قَالَ مَنْ طَلَّقَ بِغَيْرِ شُهُودٍ فَلَيْسَ بِشَيْ‏ءٍ .
13. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn ’Isma‘il ibn Bazi‘ from Muhammad ibn al- Fudayl from abu al-Sabbah al-Kinaniy who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘If one divorces his wife without witnesses it does not become of any valid effect.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī