Can’t make this stuff up. And this is from Egypt’s Al-Azhar University, which is considered Sunni Islam’s top institution.

Via OnIslam.net:
Dear brother, thank you for your question that shows your interest in Islam and your commitment to best perform your fasting.
As for your question, Muslim scholars say that swallowing unavoidable things such as one’s saliva doesn’t break the fast.
In his response to your question, Dr. Wael Shihab, PhD in Islamic Studies, Al-Azhar University [Sunni Islam’s top body -ed.], and the Head of the (English) Shari`ah Dept. of Onislam.net website, stated,
Fasting in Ramadan is one of five pillars of Islam. This fact is well-established by the Qur’an, the authentic Sunnah, and consensus (ijma`) of Muslim scholars.
On the authority of abu `abdur-Rahman `Abdullah, the son of `Umar ibn al-Kattab (may Allah be pleased with them) who said: I heard the Messenger of Allah (peace and blessings be upon him) saying, “Islam is built upon five [pillars]: testifying that there is none worthy of worship except Allah and that Muhammad is the Messenger of Allah, establishing the prayers, giving zakah, making pilgrimage (hajj) to the House and fasting the month of Ramadan.” (Al-Bukhari and Muslim) […]
Regarding your question about swallowing one’s saliva while fasting, this doesn’t invalidate the fast as it is unavoidable. Scholars say that the following acts do not break the fast:
a) Bathing.
b) Wearing Kuhl.
c) Kissing one’s wife or husband if he/she is able to control himself/herself.
d) Rinsing: rinsing the mouth or nostrils with water provided that it is not overdone.
e) Swallowing unavoidable things such as one’s saliva.
f) Tasting food.
g) Taking injections.
h) Smelling flowers or wearing perfumes, etc.
i) Experiencing a wet dream.
j) Eating or drinking due to forgetfulness.
k) Involuntarily vomiting.
May Allah accept your and our good deeds!
Allah Almighty knows best.
HT: ROP
