I went on an expedition with the Messenger of Allah (ﷺ), and I was present with him at the conquest. He stayed eighteen days in Mecca and prayed only two rak'ahs (at each time of prayer). And he said: You who live in the town must pray four; we are travellers.
Reference: Sunan Abi Dawud 1229 In-book : Book 4, Hadith 32 English translation : Book 4, Hadith 1225
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