Abu Hanifa and Muhammad do not treat a mouthful of phlegm from the interior as invalidating, while Abu Yusuf treats a mouthful as invalidating.
The dispute concerns phlegm rising from the internal cavity; mucus descending from the head is distinguished from it.
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Invalidators of Wudu: Actual and Constructive Causes
Abu Hanifa and Muhammad do not treat a mouthful of phlegm from the interior as invalidating, while Abu Yusuf treats a mouthful as invalidating.
The dispute concerns phlegm rising from the internal cavity; mucus descending from the head is distinguished from it.