الكافي- ط الاسلامية, volume 3, page 364

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) (a.s.), 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.”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.

2. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from Hammad from al-Halabiy who has said the following: “I once asked abu ‘Abd Allah (a.s.), about a man who experiences nostril bleeding in Salah (prayer). He (the Imam) said, ‘If it is possible for him to reach on his right, left or forward when still facing al-Qiblah (al-Ka‘bah), he washes it clean, then completes the remaining of his Salah (prayer). If he cannot find water without turning away from al-Qiblah (al-Ka‘bah), his Salah (prayer) is discontinued.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.

3. Muhammad ibn Yahya has narrated from Muhammad ibn al-Husayn from Safwan ibn Yahya from ‘Abd al- Rahman ibn al-Hajjaj who has said the following: “I once asked abu al-Hassan (a.s.), about a man who feels something in his abdomen and he is able to bear it. Can he perform Salah (prayer) in that condition or not? He (the Imam) said, ‘If he can remain patient without fear of hastening his Salah (prayer), he completes his Salah (prayer) and exercise patience.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.

4. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad and Muhammad ibn al-Husayn from Muhammad ibn ’Isma‘il ibn Bazi‘ from Mansur ibn Yunus from abu Bakr al-Hadramiy who has said the following: “Abu Ja‘far, and abu ‘Abd Allah, ‘Alayhim al-Salam, would say, ‘Only four things discontinue Salah (prayer): defecation, urination, gas and sound.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.

5. Ali ibn Ibrahim has narrated from Muhammad ibn ‘Isa from Yunus from al-‘Ala’ from Muhammad ibn Muslim who has said the following: “About a man who during Salah (prayer) touches his nose and finds blood; one of the two Imam, abu Ja‘far or abu ‘Abd Allah, ‘Alayhim al-Salam, has said, ‘If it is dry he throws it away and it is not harmful.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.

6. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from Jamil ibn Darraj from Zurarah who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘Laughing does not invalidate Wudu’ but it invalidates Salah (prayer).”’

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.