(1) بَابُ مَا جَاءَ فِي إِجَازَةِ خَبَرِ الْوَاحِدِ الصَّدُوقِ فِي الأَذَانِ وَالصَّلاَةِ وَالصَّوْمِ وَالْفَرَائِضِ وَالأَحْكَامِ
Narrated Al-Bara':
When Allah's Messenger (ﷺ) arrived at Medina, he prayed facing Jerusalem for sixteen or seventeen months but he wished that he would be ordered to face the Ka`ba. So Allah revealed: -- 'Verily! We have seen the turning of your face towards the heaven; surely we shall turn you to a prayer direction (Qibla) that shall please you.' (2.144) Thus he was directed towards the Ka`ba. A man prayed the `Asr prayer with the Prophet (ﷺ) and then went out, and passing by some people from the Ansar, he said, "I testify. that I have prayed with the Prophet (ﷺ) and he (the Prophet) has prayed facing the Ka`ba." Thereupon they, who were bowing in the `Asr prayer, turned towards the Ka`ba.
Reference: Sahih al-Bukhari 7252
In-book reference: Book 95, Hadith 7
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 91, Hadith 358