Mishkat al-Masabih 4 Prayer كتاب الصلاة 366

وَعَنْ عَامِرِ بْنِ سَعْدٍ عَنْ أَبِيهِ قَالَ: كُنْتُ أَرَى رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُسَلِّمُ عَنْ يَمِينِهِ وَعَنْ يَسَارِهِ حَتَّى أرى بَيَاض خَدّه. رَوَاهُ مُسلم

‘Amir b. Sa’d quoted his father as saying that he used to see God’s Messenger giving the salutation* to his right and his left, so that he could see the whiteness of his cheek. *1. I.e. pronouncing the taslim . Muslim transmitted it.