Sayyiduna Jabir (may Allah be pleased with him) narrates this saying of the Prophet (peace and blessings be upon him): "Smiling does not break the prayer; laughing aloud breaks it."
Al-Tabarani recorded it in al-Mu'jam al-Saghir as marfu' and as mawquf (that is, in both ways), and its narrators have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2440
Hadith Gradingمحدثین:إسنادہ حسن
Hadith Takhrij«أخرجه المعجم الصغير للطبراني برقم: 959»