he asked Ibn Al-Musaiyab about fasting on a journey, so he narrated to him that Umar bin Al-Khattab said: "We fought in two battles along with the Messenger of Allah during Ramadan; the Day of Badr, and the Conquest (of Makkah), so we broke our fast during them."
Reference: Jami` at-Tirmidhi 714 In-book : Book 8, Hadith 33 English translation : Vol. 2, Book 3, Hadith 714
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