Abu Dawud said: This tradition has been narrated by Yunus b. Jubair, Anas b. Sirin b. Jubair, Zaid b. Aslam, Abu al-Zubair and Mansur from Abu Wa'il on the authority of Ibn 'Umar. They all agreed on the theme that the Prophet (ﷺ) commanded him to take her back (and keep her) till she was purified. Then if he desired, he might divorce her or keep her with him if he wanted to do so. The version narrated by al-Zuhri from Salim from Nafi' on the authority of Ibn 'Umar has: The Prophet (ﷺ) commanded him to take her back (and keep her) till she is purified, and then has menstrual discharge, and then she is purified. Then if he desires, he may divorce her and if he desires he may keep her.
Abu Dawud said: A version like that of Nafi' and al-Zuhri has also been transmitted by 'Ata al-Khurasani from al-Hasan on the authority of Ibn 'Umar. All the versions of this tradition contradict the one narrated by Abu al-Zubair.