عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَانَ يَكْتَحِلُ بِالْإِثْمَدِ كُلَّ لَيْلَةٍ قَبْلَ أَنْ يَنَامَ وَكَانَ يَكْتَحِلُ فِي كُلِّ عَيْنٍ ثَلَاثَةَ أَمْيَالٍ
It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Noble Prophet (peace and blessings be upon him and his family) used to apply ithmid kohl every night before sleeping, and he (peace and blessings be upon him and his family) would put three strokes of kohl in each eye.