(23) باب مَنْ رَأَى عَلَيْهِ كَفَّارَةً إِذَا كَانَ فِي مَعْصِيَةٍ
Narrated Ibn 'Abbas:
While the Prophet (ﷺ) was preaching a man was standing in the sun. He asked about him. They said: He is Abu Isra'il who has taken a vow to stand and not to sit, or go into shade, or speak, but to fast. Thereupon he said: Command him to speak, to go into the shade, sit and complete his fast.
Reference: Sunan Abi Dawud 3300
In-book reference: Book 22, Hadith 59
English translation: Book 21, Hadith 3294