Things That Invalidate Salah (Prayer) Like Laughing, Invalidating Wudu’, Making a Gesture, Forgetting and So on

1. A group has narrated from Ahmad ibn Muhammad ibn ‘Isa, from al-Husayn ibn Sa‘id, from his brother al-Hassan, from Zur’ah, from Sama‘ah who has said the following: “I once asked him (the Imam) عليه السلام, about laughing if it destroys Salah (prayer). He (the Imam) said, ‘Smiling does not destroy Salah (prayer) but laughing loudly destroys it.’” It (the above Hadith) also is narrated from Ahmad ibn Muhammad from ‘Uthman ibn ‘Isa from Sama‘ah.”