Abdul Malik bin 'Umayr al-Qabti عبد الملك بن عمير بن سويد القبطي · The Book of Salah

"The Messenger of Allah (ﷺ) came to Al-Madinah and prayed toward Bait Al-Maqdis for sixteen months, then he was commanded to face towards the Ka'bah. A man who had prayed with the Prophet (ﷺ) passed by some of the Ansar and said: 'I bear witness that the Messenger of Allah (ﷺ) has been commanded to face towards the Ka'bah' so they turned to face the Ka'bah."