[Machine] That Safiyyah became menstruating after she completed the Tawaf of the Day of Sacrifice at the Holy Kaaba, so the Messenger of Allah ﷺ commanded her to join the army.
أَنَّ صَفِيَّةَ حَاضَتْ بَعْدَمَا طَافَتْ يَوْمَ النَّحْرِ بِالْبَيْتِ «فَأَمَرَهَا رَسُولُ اللهِ ﷺ أَنْ تَنْفِرَ»