نا نا أَحْمَدُ بْنُ عَبْدِ اللَّهِ الْوَكِيلُ ، نا الْحَسَنُ بْنُ عَرَفَةَ ، ثنا هُشَيْمٌ ، عَنْ سُلَيْمَانَ بْنِ الْمُغِيرَةِ ، عَنْ حُمَيْدِ بْنِ هِلالٍ ، عَنْ أَبِي مُوسَى الأَشْعَرِيِّ ، أَنَّهُ كَانَ يُصَلِّي بِالنَّاسِ فَرَأَوْا شَيْئًا فَضَحِكَ بَعْضُ مَنْ كَانَ مَعَهُ ، فَقَالَ أَبُو مُوسَى حَيْثُ انْصَرَفَ : " مَنْ كَانَ ضَحِكَ مِنْكُمْ فَلْيُعِدِ الصَّلاةَ ".
It is narrated about Sayyiduna Abu Musa Ash'ari, may Allah be pleased with him: He was leading the people in prayer, and the people saw something due to which some of them laughed while following Sayyiduna Abu Musa. So after completing the prayer, Sayyiduna Abu Musa, may Allah be pleased with him, said: Whoever among you laughed should repeat the prayer.