[Machine] Smiling does not invalidate the prayer, but laughing out loud is what is prohibited and is considered a disruption. This ruling has been stated by Thabit ibn Muhammad al-Zahid and it is a consensus among scholars.
التَّبَسُّمُ لَا يَقْطَعُ الصَّلَاةَ وَلَكِنِ الْقَرْقَرَةُ هَذَا هُوَ الْمَحْفُوظُ مَوْقُوفٌ وَقَدْ رَفَعَهُ ثَابِتُ بْنُ مُحَمَّدٍ الزَّاهِدُ وَهُوَ وَهْمٌ مِنْهُ
Sign in from the top menu to add or reply to reflections.