That the Messenger of Allah ﷺ used to say the taslim to his right and to his left.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُسَلِّمُ عَنْ يَمِينِهِ وَعَنْ يَسَارِهِ  

"I used to see the Messenger of Allah ﷺ saying the taslim to his right and to his left until the whiteness of his cheek could be seen."  

كُنْتُ أَرَى رَسُولَ اللَّهِ ﷺ يُسَلِّمُ عَنْ يَمِينِهِ وَعَنْ يَسَارِهِ حَتَّى يُرَى بَيَاضُ خَدِّهِ قَالَ أَبُو عَبْدِ الرَّحْمَنِ عَبْدُ اللَّهِ بْنُ جَعْفَرٍ هَذَا لَيْسَ بِهِ بَأْسٌ وَعَبْدُ اللَّهِ بْنُ جَعْفَرِ بْنِ نَجِيحٍ وَالِدُ عَلِيِّ بْنِ الْمَدِينِيِّ مَتْرُوكُ الْحَدِيثِ