Hadith 10:207
Abu Bakr narrated to us, he said: Abda bin Sulayman narrated to us, from Sa’id, from Qatada, from Sa’id bin al-Musayyib, who said: The divorce of the mentally deficient person who is overcome in his intellect is nothing; his divorce is [entrusted] to his guardian.
حدثنا أبو بكر قال نا عبدة بن سليمان عن سعيد عن قتادة عن سعيد بن المسيب قال طلاق المعتوه المغلوب على عقله ليس بشيء طلاقه إلى وليه