Ibn `Umar recited the verse: "They had a choice either to fast or to feed a poor person for every day, and said that the order of this Verse was canceled.
Sahih al-Bukhari Book 30, Hadith 56
← Previous Hadith Ibn `Abbas said, "Allah's Messenger (ﷺ) set out from Medina to Mecca and he fasted till he reached 'Usfan, where he asked for water and raised his hand to let the people see him, and then broke the fast, and did not fast after that till he reached Mecca, and that happened in Ramadan." Ibn `Abbas used to say, "Allah's Messenger (ﷺ) (sometimes) fasted and (sometimes) did not fast during the journeys so whoever wished to fast could fast, and whoever wished not to fast, could do so."

Sahih al-Bukhari Book 30, Hadith 55 Next Hadith → Sometimes I missed some days of Ramadan, but could not fast in lieu of them except in the month of Sha'ban." Said Yahya, a sub-narrator, "She used to be busy serving the Prophet (ﷺ) ."

Sahih al-Bukhari Book 30, Hadith 57