Sahih Muslim 1640
The Book of Prayer - Travellers
وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا أَبُو عَوَانَةَ، عَنِ السُّدِّيِّ، قَالَ سَأَلْتُ أَنَسًا كَيْفَ أَنْصَرِفُ إِذَا صَلَّيْتُ عَنْ يَمِينِي أَوْ عَنْ يَسَارِي قَالَ أَمَّا أَنَا فَأَكْثَرُ مَا رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَنْصَرِفُ عَنْ يَمِينِهِ .
Suddi reported:I asked Anas how I should turn-to the right or to the left-when I say my prayers. He said: I have very often seen the Messenger of Allah (ﷺ) turning to the right
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.