الكافي- ط الاسلامية, volume 4, page 107

1. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from Hammad who has said the following: “I once asked abu ‘ Abd Allah (a.s.), about a man who takes wudu’ (ablution) and water enters in his throat. He (the Imam) said, ‘If his wudu’ (ablution) is for an obligatory Salat (prayer) there is not anything on him, but if it is for an optional Salat (prayer); he is required to make its Qada’ (compensatory fast).”’

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

2. Ali ibn Ibrahim has narrated from his father from ‘Isma‘il ibn Marrar from Yunus from abu Jamilah from Zayd who has said the following: “I once asked abu ‘Abd Allah (a.s.), about a man who rinses his mouth when he is fasting. He (the Imam) said, ‘He must not swallow his saliva before discharging it out of his mouth three times.’”

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

3. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from Hammad from those whom he has mentioned who has said the following: “I once asked abu ‘Abd Allah (a.s.), about a man who rinses his mouth and nostril when he is fasting. He (the Imam) said, ‘Yes, he can do so but he must not swallow it.’”

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

4. A number of our people have narrated from Sahl ibn Ziyad from al-Rayyan ibn al-Salt from Yunus who said: “One who is fasting in the month of Ramadan can brush his teeth whenever he wants; but if one rinses his mouth during the time of obligatory prayers, and water enters his throat, there is nothing upon him, and he can complete his fast. And if one rinses his mouth in a time other than the time of obligatory prayers, and water enters his throat, one must repeat it (fast again). And it is better for the one fasting not to rinse his mouth.’”

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