[Machine] The Prophet ﷺ said, "Use al-ithmid, as it clears the vision and promotes hair growth." It is claimed that the Messenger of Allah ﷺ used to have a kohl container with which he would apply kohl three times in one eye and three times in the other eye every night. This is the most authentic narration regarding the kohl application of the Prophet ﷺ.  

أَنَّ النَّبِيَّ ﷺ قَالَ عَلَيْكُمْ بِالْإِثْمِدِ فَإِنَّهُ يَجْلُو الْبَصَرَ وَيُنْبِتُ الشَّعْرَ وَزَعَمَ أَنَّ رَسُولَ اللهِ ﷺ كَانَتْ لَهُ مُكْحُلَةٌ يَكْتَحِلُ مِنْهَا كُلَّ لَيْلَةٍ ثَلَاثًا فِي هَذِهِ وَثَلَاثًا فِي هَذِهِ هَذَا أَصَحُّ مَا رُوِيَ فِي اكْتِحَالِ النَّبِيِّ ﷺ  

[Machine] The Prophet ﷺ used to apply kohl while fasting. Abu Sa'd al-Malini narrated to us, reporting from Abu Ahmad ibn 'Adi al-Hafiz, who narrated from al-Fadl ibn 'Abdullah al-Antaki, who narrated from Luwayn, who narrated from Hibban, who narrated from Ali ibn Muhammad ibn 'Ubaidullah ibn Abi Rafi', and this is also reported by.  

أَنَّ النَّبِيَّ ﷺ كَانَ يَكْتَحِلُ بِالْإِثْمِدِ وَهُوَ صَائِمٌ أَخْبَرَنَاهُ أَبُو سَعْدٍ الْمَالِينِيُّ أنبأ أَبُو أَحْمَدَ بْنُ عَدِيٍّ الْحَافِظُ ثنا الْفَضْلُ بْنُ عَبْدِ اللهِ الْأَنْطَاكِيُّ ثنا لُوَيْنٌ ثنا حِبَّانُ عَنْ عَلِيِّ بْنِ مُحَمَّدِ بْنِ عُبَيْدِ اللهِ بْنِ أَبِي رَافِعٍ وَكَذَلِكَ  

[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  

[Machine] And his grandfather brought him to the Prophet ﷺ , so the Prophet ﷺ wiped his head and said, "Do not apply kohl during the day while you are fasting. Apply kohl at night, as antimony clears the vision and promotes hair growth." Sheikh Abdul Rahman, son of Nu'man ibn Ma'bad ibn Hawdha, father of Nu'man, and Ma'bad ibn Hawdha Al-Ansari- he is the one to whom this companionship belongs.  

وَكَانَ جَدُّهُ أَتَى بِهِ النَّبِيُّ ﷺ فَمَسَحَ عَلَى رَأْسِهِ فَقَالَ لَا تَكْتَحِلْ بِالنَّهَارِ وَأَنْتَ صَائِمٌ اكْتَحِلْ لَيْلًا الْإِثْمِدُ يَجْلُو الْبَصَرَ وَيُنْبِتُ الشَّعْرَ قَالَ الشَّيْخُ عَبْدُ الرَّحْمَنِ هُوَ ابْنُ النُّعْمَانِ بْنِ مَعْبَدِ بْنِ هَوْذَةَ أَبُو النُّعْمَانِ وَمَعْبَدُ بْنُ هَوْذَةَ الْأَنْصَارِيُّ هُوَ الَّذِي لَهُ هَذِهِ الصُّحْبَةُ