[Machine] Sawda was in a state of istihadah, so the Messenger of Allah ﷺ ordered her that when her days are over, she should perform ghusl and offer salah. Imam Ahmad, may Allah the Exalted have mercy on him, said that this is regarding a certain matter...
أَنَّ سَوْدَةَ اسْتُحِيضَتْ فَأَمَرَهَا رَسُولُ اللهِ ﷺ إِذَا مَضَتْ أَيَّامُهَا اغْتَسَلَتْ وَصَلَّتْ قَالَ الْإِمَامُ أَحْمَدُ رَحِمَهُ اللهُ تَعَالَى وَهَذَا فِيمَا