حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَمُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، وَأَبُو كُرَيْبٍ - وَاللَّفْظُ لأَبِي كُرَيْبٍ - قَالُوا حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنِ الأَعْمَشِ، عَنْ شَقِيقٍ، عَنْ حُذَيْفَةَ، قَالَ كُنَّا مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَ ‏"‏ أَحْصُوا لِي كَمْ يَلْفِظُ الإِسْلاَمَ ‏"‏ ‏.‏ قَالَ فَقُلْنَا يَا رَسُولَ اللَّهِ صلى الله عليه وسلم أَتَخَافُ عَلَيْنَا وَنَحْنُ مَا بَيْنَ السِّتِّمِائَةِ إِلَى السَّبْعِمِائَةِ قَالَ ‏"‏ إِنَّكُمْ لاَ تَدْرُونَ لَعَلَّكُمْ أَنْ تُبْتَلَوْا ‏"‏ ‏.‏ قَالَ فَابْتُلِينَا حَتَّى جَعَلَ الرَّجُلُ مِنَّا لاَ يُصَلِّي إِلاَّ سِرًّا ‏.‏

Hudhaifa reported: We were in the company of the Messenger of Allah (PBUH) when he said. Count for me those who profess al-Islam. We said: Messenger of Allah, do you entertain any fear concerning us and we are (at this time) between six hundred and seven hundred (in strength). He (the Holy Prophet) remarked: You don't perceive; you may be put to some trial, He (the narrator) said: We actually suffered trial so much so that some of our men were constrained to offer their prayers in concealment. Translation Not Available

Book Ref: Sahih Muslim Book 1 Hadith 275
Web Ref:  Sahih Muslim Book 1 Hadith 149