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He said that some of the companions of God’s messenger came to the Prophet (ﷺ) to consult him saying, “We have thoughts which none of us dare to talk about.” He said, “Have you experienced that?” and when they replied that they had, he said, “That is clear faith.” Muslim transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: جَاءَ نَاسٌ مِنْ أَصْحَابِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَسَأَلُوهُ: إِنَّا نَجِدُ فِي أَنْفُسِنَا مَا يَتَعَاظَمُ أَحَدُنَا أَنْ يَتَكَلَّمَ بِهِ. قَالَ: «أَو قد وجدتموه» قَالُوا: نعم. قَالَ: «ذَاك صَرِيح الْإِيمَان» . رَوَاهُ مُسلم
sunnah.com