Hadith 10:441
Abu Bakr narrated to us, he said: Abu Usama narrated to us, from Ubayd Allah, from Nafi’, from Ibn Umar, he said: It is three, so she is not lawful for him until she marries a husband other than him.
حدثنا أبو بكر قال نا أبو أسامة عن عبيد الله عن نافع عن بن عمر قال هي ثلاث فلا تحل له حتى تنكح زوجا غيره