If the fasting Person rinses out his Mouth and some Water enters his Throat
Question :
If the fasting person rinses out his mouth or cleans his nose with water and some of the water enters his throat unintentionally, does this nullify his fast?
Answer:
If the fasting person rinses out his mouth or cleans his nose with water and the water enters his inner body, this does not break his fast, because he did not do that intentionally. This is due to Allâh's Statement:
"But what your hearts purposefully intended."
Source:
Ash-Shaykh Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 3 Page 260