The Book of Divorce
وَحَدَّثَنَاهُ أَبُو الرَّبِيعِ، وَقُتَيْبَةُ، قَالاَ حَدَّثَنَا حَمَّادٌ، عَنْ أَيُّوبَ، بِهَذَا الإِسْنَادِ . نَحْوَهُ غَيْرَ أَنَّهُ قَالَ فَسَأَلَ عُمَرُ النَّبِيَّ صلى الله عليه وسلم فَأَمَرَهُ .A hadith like this has been transmitted on the authority of Ayyub with a slight variation of words
From Sahih Muslim, whose reports the scholars accept as authentic.