An army unit was being recruited from the people of Medina and my name was written among them. Then I met `Ikrima, and when I informed him about it, he discouraged me very strongly and said, "Ibn `Abbas told me that there were some Muslims who were with the pagans to increase their number against Allah's Messenger (ﷺ) (and the Muslim army) so arrows (from the Muslim army) would hit one of them and kill him or a Muslim would strike him (with his sword) and kill him. So Allah revealed:-- 'Verily! As for those whom the angels take (in death) while they are wronging themselves (by staying among the disbelievers).' (4.97)
Sahih al-Bukhari Book 92, Hadith 36
← Previous Hadith The people used to ask Allah's Messenger (ﷺ) about the good but I used to ask him about the evil lest I should be overtaken by them. So I said, "O Allah's Messenger (ﷺ)! We were living in ignorance and in an (extremely) worst atmosphere, then Allah brought to us this good (i.e., Islam); will there be any evil after this good?" He said, "Yes." I said, 'Will there be any good after that evil?" He replied, "Yes, but it will be tainted (not pure.)'' I asked, "What will be its taint?" He replied, "(There will be) some people who will guide others not according to my tradition? You will approve of some of their deeds and disapprove of some others." I asked, "Will there be any evil after that good?" He replied, "Yes, (there will be) some people calling at the gates of the (Hell) Fire, and whoever will respond to their call, will be thrown by them into the (Hell) Fire." I said, "O Allah s Apostle! Will you describe them to us?" He said, "They will be from our own people and will speak our language." I said, "What do you order me to do if such a state should take place in my life?" He said, "Stick to the group of Muslims and their Imam (ruler)." I said, "If there is neither a group of Muslims nor an Imam (ruler)?" He said, "Then turn away from all those sects even if you were to bite (eat) the roots of a tree till death overtakes you while you are in that state."

Sahih al-Bukhari Book 92, Hadith 35 Next Hadith → Allah's Messenger (ﷺ) related to us, two prophetic narrations one of which I have seen fulfilled and I am waiting for the fulfillment of the other. The Prophet (ﷺ) told us that the virtue of honesty descended in the roots of men's hearts (from Allah) and then they learned it from the Qur'an and then they learned it from the Sunna (the Prophet's traditions). The Prophet (ﷺ) further told us how that honesty will be taken away: He said: "Man will go to sleep during which honesty will be taken away from his heart and only its trace will remain in his heart like the trace of a dark spot; then man will go to sleep, during which honesty will decrease further still, so that its trace will resemble the trace of blister as when an ember is dropped on one's foot which would make it swell, and one would see it swollen but there would be nothing inside. People would be carrying out their trade but hardly will there be a trustworthy person. It will be said, 'in such-and-such tribe there is an honest man,' and later it will be said about some man, 'What a wise, polite and strong man he is!' Though he will not have faith equal even to a mustard seed in his heart." No doubt, there came upon me a time when I did not mind dealing (bargaining) with anyone of you, for if he was a Muslim his Islam would compel him to pay me what is due to me, and if he was a Christian, the Muslim official would compel him to pay me what is due to me, but today I do not deal except with such-and-such person.

Sahih al-Bukhari Book 92, Hadith 37