Amir b. Sa'd reported on the authority of his father that Allah's Messenger (ﷺ) said:
The greatest sinner amongst the Muslims is one who asked about a thing (from Allah's Apostle) which had not been forbidden for the Muslims and it was forbidden for them because of his persistently asking about it.
Reference: Sahih Muslim 2358 a In-book : Book 43, Hadith 174 USC-MSA web (English) : Book 30, Hadith 5821 (deprecated)
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