Sahih al-Bukhari Book 61, Hadith 119
We complained to Allah's Messenger (ﷺ) (of the persecution inflicted on us by the infidels) while he was
sitting in the shade of the Ka`ba, leaning over his Burd (i.e. covering sheet). We said to him, "Would
you seek help for us? Would you pray to Allah for us?" He said, "Among the nations before you a
(believing) man would be put in a ditch that was dug for him, and a saw would be put over his head
and he would be cut into two pieces; yet that (torture) would not make him give up his religion. His
body would be combed with iron combs that would remove his flesh from the bones and nerves, yet
that would not make him abandon his religion. By Allah, this religion (i.e. Islam) will prevail till a
traveler from Sana (in Yemen) to Hadrarmaut will fear none but Allah, or a wolf as regards his sheep,
but you (people) are hasty.
I relate the traditions of Allah's Messenger (ﷺ) to you for I would rather fall from the sky than attribute something to him falsely. But when I tell you a thing which is between you and me, then no doubt, war is guile. I heard Allah's Messenger (ﷺ) saying, "In the last days of this world there will appear some young foolish people who will use (in their claim) the best speech of all people (i.e. the Qur'an) and they will abandon Islam as an arrow going through the game. Their belief will not go beyond their throats (i.e. they will have practically no belief), so wherever you meet them, kill them, for he who kills them shall get a reward on the Day of Resurrection."
The Prophet (ﷺ) noticed the absence of Thabit bin Qais. A man said, "O Allah's Messenger (ﷺ)! I shall bring you his news." So he went to him and saw him sitting in his house drooping his head (sadly). He asked Thabit, "What's the matter?" Thabit replied, "An evil situation: A man used to raise his voice over the voice of the Prophet (ﷺ) and so all his good deeds have been annulled and he is from the people of Hell." The man went back and told the Prophet (ﷺ) that Thabit had said so-and-so. (The sub-narrator, Musa bin Anas said, "The man went to Thabit again with glad tidings)." The Prophet (ﷺ) said to him, "Go and say to Thabit: 'You are not from the people of Fire, but from the people of Paradise."