We were in the company of the Messenger of Allah ﷺ 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.  

كُنَّا مَعَ رَسُولِ اللَّهِ ﷺ فَقَالَ أَحْصُوا لِي كَمْ يَلْفِظُ الإِسْلاَمَ قَالَ فَقُلْنَا يَا رَسُولَ اللَّهِ ﷺ 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