عَنْ سَهْلِ بْنِ مُعَاذٍ عَنْ أَبِيهِ رَضِيَ اللَّهُ عَنْهُ عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنَّهُ كَانَ يَقُولُ: ((الضَّاحِكُ فِي الصَّلَاةِ وَالْمُلْتَفِتُ وَالْمُفَقِّعُ أَصَابِعَهُ بِمَنْزِلَةٍ وَاحِدَةٍ))
It is narrated from Sayyiduna Mu'adh (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Those who laugh in prayer, those who peep, and those who crack their fingers are of the same rank.