Abu Ma'mar reported
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.
'Abdullah reported
An Amir or a person pronounced taslim twice. 'Abdullah said: Where did he get this sunnah?
'Amir b. Sa'd reported
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.