There was an Amir in Mecca who pronounced taslim twice. Abdullah said: Where did he get this sunnah? Al-Hakam said: There is a hadith to the effect that the Messenger of Allah ﷺ did like It.  

الْحَكَمُ فِي حَدِيثِهِ إِنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَفْعَلُهُ  

An Amir or a person pronounced taslim twice. 'Abdullah said: Where did he get this sunnah?  

عَبْدُ اللَّهِ أَنَّى عَلِقَهَا  

I saw the Messenger of Allah (may peace be open him) pronouncing taslim on his right and on his left till I saw the whiteness of his cheek.  

كُنْتُ أَرَى رَسُولَ اللَّهِ ﷺ يُسَلِّمُ عَنْ يَمِينِهِ وَعَنْ يَسَارِهِ حَتَّى أَرَى بَيَاضَ خَدِّهِ