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. (Using translation from Muslim 582)
كُنْتُ أَرَى رَسُولَ اللهِ ﷺ «يُسَلِّمُ عَنْ يَمِينِهِ وَعَنْ يَسَارِهِ حَتَّى يُرَى بَيَاضُ خَدِّهِ»