It is narrated on the authority of 'Abdullah b. Mas'ud that the Messenger of Allah (ﷺ) observed:
None shall enter the Fire (of Hell) who has in his heart the weight of a mustard seed of Iman and none shall enter Paradise who has in his heart the weight of a mustard seed of pride.
Reference: Sahih Muslim 91 b In-book : Book 1, Hadith 172 USC-MSA web (English) : Book 1, Hadith 165 (deprecated)
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