Humaid bin Hilal narrates: Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him) was leading his companions in prayer. His companions saw something that made them laugh, so after finishing the prayer, Sayyiduna Abu Musa Ash'ari said: Whoever among you laughed should repeat the prayer.
Hadith Referenceسنن الدارقطني / كتاب الطهارة / 664
Hadith Takhrij«أخرجه البيهقي فى((سننه الكبير)) برقم: 687، والدارقطني فى ((سننه)) برقم: 664، 665، وابن أبى شيبة فى ((مصنفه)) برقم: 3935»