A little urine comes out of him after he does wudoo’; is he excused for that?

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Check below answers in case you are looking for other related questions:
Purification and prayer for one who has urinary incontinence
It is permissible for the husband to receive well-wishers when he is junub

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Purification and prayer for one who has urinary incontinence
It is permissible for the husband to receive well-wishers when he is junub

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