The difference between the ruling on swallowing sputum and its effect on the fast, and swallowing a pebble

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Check below answers in case you are looking for other related questions:
If he swallows bits of his skin, does that invalidate his fast?
Is the fast invalidated by swallowing phlegm or sticking one’s finger in one’s ear?

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If he swallows bits of his skin, does that invalidate his fast?
Is the fast invalidated by swallowing phlegm or sticking one’s finger in one’s ear?

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