[Machine] Perhaps the Prophet ﷺ applied kohl while fasting. Abu Abdullah Al-Hafiz and Abu Sa'eed ibn Abi Amr reported to us that Abu Al-Abbas Muhammad ibn Ya'qub told us that Muhammad ibn Ishaq Al-Saghani told us that Ahmad ibn Abu Tayyib told us that Baqiyyah ibn Al-Walid narrated from Sa'eed Al-Zubaidi, who mentioned it. Sa'eed Al-Zubaidi was one of the Shaykhs of Baqiyyah and was known for narrating rare hadiths that were not widely known. It was also reported from Anas ibn Malik in a weak chain of narration with Marrah that he did not see any harm in it. However, there is a hadith prohibiting it during the day while fasting.  

رُبَّمَا اكْتَحَلَ النَّبِيُّ ﷺ وَهُوَ صَائِمٌ أَخْبَرَنَاهُ أَبُو عَبْدِ اللهِ الْحَافِظُ وَأَبُو سَعِيدِ بْنُ أَبِي عَمْرٍو قَالَا ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثنا مُحَمَّدُ بْنُ إِسْحَاقَ الصَّغَانِيُّ ثنا أَحْمَدُ بْنُ أَبِي الطَّيِّبِ ثنا بَقِيَّةُ بْنُ الْوَلِيدِ عَنْ سَعِيدٍ الزُّبَيْدِيِّ فَذَكَرَهُ وَسَعِيدٌ الزُّبَيْدِيُّ مِنْ مَجَاهِيلِ شُيُوخِ بَقِيَّةَ يَنْفَرِدُ بِمَا لَا يُتَابَعُ عَلَيْهِ وَرُوِيَ عَنْ أَنَسِ بْنِ مَالِكٍ مَرْفُوعًا بِإِسْنَادٍ ضَعِيفٍ بِمَرَّةٍ أَنَّهُ لَمْ يَرَ بِهِ بَأْسًا وَقَدْ رُوِيَ فِي النَّهْيِ عَنْهُ نَهَارًا وَهُوَ صَائِمٌ حَدِيثٌ