question #1 Sahih Muslim 149, Book 1, Hadith 284 : What concerns did the Prophet Muhammad (ﷺ) express about the future trials faced by the early Muslims?

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.