That the Prophet ﷺ entered upon her on Friday while she was fasting. He asked: Did you fast yesterday ? She said: No. He again asked: Do you intend to fast tomorrow ? She said: No. He said: So break your fast.  

أَنَّ النَّبِيَّ ﷺ دَخَلَ عَلَيْهَا يَوْمَ الْجُمُعَةِ وَهِيَ صَائِمَةٌ فَقَالَ أَصُمْتِ أَمْسِ قَالَتْ لاَ قَالَ تُرِيدِينَ أَنْ تَصُومِي غَدًا قَالَتْ لاَ قَالَ فَأَفْطِرِي  

When it was mentioned to Ibn Shihab (al-Zuhri) that fasting on Saturday had been prohibited, he would say: This is a Himsi tradition.  

عَنْ صِيَامِ يَوْمِ السَّبْتِ يَقُولُ ابْنُ شِهَابٍ هَذَا حَدِيثٌ حِمْصِيٌّ  

I always concealed it, but I found that it became known widely, that is, the tradition on Ibn Busr about fasting on Saturday. Abu Dawud said: Malik said: This is a false (tradition).  

مَالِكٌ هَذَا كَذِبٌ