The ruling on a fasting person swallowing his saliva
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Question: What is the ruling on a fasting person swallowing his saliva?
Answer: There is no harm in swallowing saliva, and I am not aware of any disagreement among the scholars regarding this, due to the difficulty or impossibility of guarding against it. As for phlegm and mucus, it is obligatory to expel them if they reach the mouth, and it is not permissible for a fasting person to swallow them because it is possible to guard against them, unlike saliva. And success is from Allah.
Answer: There is no harm in swallowing saliva, and I am not aware of any disagreement among the scholars regarding this, due to the difficulty or impossibility of guarding against it. As for phlegm and mucus, it is obligatory to expel them if they reach the mouth, and it is not permissible for a fasting person to swallow them because it is possible to guard against them, unlike saliva. And success is from Allah.
Source
binbaz.org.sa
The Arabic text is copied verbatim from the original source, without any edits.