The Messenger of Allah (ﷺ) distributed shares (of booty among his Companions). I said: Messenger of Allah! Give it to so and so, for verily he is a believer. Upon this the Messenger of Allah remarked: Or a Muslim. I (the narrator) repeated it (the word" believer" ) thrice and he (the Holy Prophet) turned his back upon me (and substituted the word)" Muslim," and then observed: I bestow it (this share) to a man out of apprehension lest Allah should throw him prostrate into the fire (of Hell) whereas in fact the other man is dearer to me than he.
Sahih Muslim Book 1, Hadith 285
← Previous Hadith 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.

Sahih Muslim Book 1, Hadith 284 Next Hadith → The Messenger of Allah (ﷺ) ignored some of them. And he who was ignored seemed to be more deserving in my eyes (as compared with others). I (Sa'd) said: Messenger of Allah I why is it that you did not give to such and such (man)? Verily I see him a believer. Upon this the Messenger of Allah (ﷺ) observed: Or a Muslim? I kept quiet for some time but I was again impelled (to express) what I knew about him. I said: Messenger of Allah why is it that you did not give it to such and such? Verily, by Allah, see him a believer. Upon this the Messenger of Allah (ﷺ) remarked: (Nay, not a believer) but a Muslim. He (Sa'd) said: I again kept quite for some time but what I knew about him again impelled me (to express my opinion) and I said: Why is it that you did not give (the share) to so and so: By Allah, verily I see him a believer. The Messenger of Allah (ﷺ) remarked; (Nay, not so) but a Muslim. Verily (at times) I give (a share) to a certain man apprehending that he may not be thrown prostrate in the Fire, whereas the other man (who is not given) is dearer to me (as compared with him).

Sahih Muslim Book 1, Hadith 286