Abdullah bin Sa'id al-Ashaj عبد الله بن سعيد بن حصين الكندي - الأشج · The Book on Fasting

"We were with Ammar bin Yasir when a roasted sheep was brought and he said: 'Eat.' Someone among the people said: 'I am fasting.' So Ammar said: 'Whoever fasts on a day in which there is doubt, then he has disobeyed Abul-Qasim (pbuh)."

"A woman came to the Prophet and said: 'My sister died while she had two consecutive months of fasting due.' So he said: 'Do you not see that if there was a debt due from your sister then you would have to pay it?' She said: 'Yes.' He said: 'Then the right of Allah is more appropriate.'"

"Whoever eats or drinks forgetfully, then he has not broken (the fast), for it was only a provision that Allah provided for him."

(Another chain) with the same or similar (Hadith as no. 721).