(31) باب فِي الْكَحْلِ عِنْدَ النَّوْمِ لِلصَّائِمِ
'Ubaid Allah b. Abu Bakr b. Anas reported on the authority of Anas b. Malik that he used to apply collyrium when he was fasting.
Reference: Sunan Abi Dawud 2378
In-book reference: Book 14, Hadith 66
English translation: Book 13, Hadith 2372