"I was sitting with the Prophet when some drink was brought, so he drank from it, then he offered it to me and I drank it. Then I said: 'I have indeed sinned, so seek forgiveness for me.' He said: 'What is that?' I said: 'I was fasting, then I broke the fast.' He said: 'Were you performing a fast that you had to make up?' I said: 'No.' He said: 'Then it is no harm for you.'"
Reference: Jami` at-Tirmidhi 731 In-book : Book 8, Hadith 50 English translation : Vol. 2, Book 3, Hadith 731
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