The Prophet (ﷺ) and his Companions used to pray in the direction of Jerusalem. When the following verse was revealed: " So turn your face towards the inviolable mosque" ; and Ye (O Muslims), wheresoever ye may be, turn your face towards it" (2:144), a man passed by the people of Banu Salamah. He called them while they were bowing in the morning prayer facing Jerusalem: Lo, the qiblah (direction of prayer) has been changed towards the ka'bah. He called them twice. So they turned their faces towards the Ka'bah while they were bowing.
Reference: Sunan Abi Dawud 1045 In-book : Book 2, Hadith 656 English translation : Book 2, Hadith 1040
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