(65) باب إِذَا طَهُرَتِ الْحَائِضُ أَوْ قَدِمَ الْمُسَافِرُ فِي رَمَضَانَ هَلْ يَصُومُ بَقِيَّةَ يَوْمِهِ .
It was narrated that Muhammad bin Saifi said:
"The Messenger of Allah said on the day of Ashura: Is there anyone among you who has eaten today?' They said: Some of us are fasting and some of us are not.' He said: 'Do not eat for the rest of the day, and send word to the people of Al-Al-Arud telling them not to eat for the rest of the day."'
Reference: Sunan an-Nasa'i 2320
In-book reference: Book 22, Hadith 231
English translation: Vol. 3, Book 22, Hadith 2322