Hadithcore
Sunan Abi Dawud, 2379
hasan· Al-Albani

Al-A'mash said:

I did not see any of our companions who abominated the use of collyrium by a man who fasting. Ibrahim would permit the man who was fasting to apply collyrium with aloes.

حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ الْمُخَرِّمِيُّ، وَيَحْيَى بْنُ مُوسَى الْبَلْخِيُّ، قَالاَ حَدَّثَنَا يَحْيَى بْنُ عِيسَى، عَنِ الأَعْمَشِ، قَالَ مَا رَأَيْتُ أَحَدًا مِنْ أَصْحَابِنَا يَكْرَهُ الْكَحْلَ لِلصَّائِمِ وَكَانَ إِبْرَاهِيمُ يُرَخِّصُ أَنْ يَكْتَحِلَ الصَّائِمُ بِالصَّبِرِ ‏.‏

References2 variants
In-Book Reference
Book 14, Hadith 67
English Reference
Book 13, Hadith 2373