[Machine] The Prophet ﷺ used to greet with "Peace be upon you and the mercy of Allah" from his right and from his left, so that they could see his face.
أَنَّ النَّبِيَّ ﷺ كَانَ يُسَلِّمُ عَنْ يَمِينِهِ «السَّلَامُ عَلَيْكُمْ وَرَحْمَةُ اللهِ» وَعَنْ يَسَارِهِ مِثْلَ ذَلِكَ حَتَّى تَبْدُوَ لَهُمْ صَفْحَتُهُ