Narrated Sahl bin Sa`d As-Sa`idi:
Allah's Messenger (ﷺ) and the pagans faced each other and started fighting. When Allah's Messenger (ﷺ) returned to his camp and when the pagans returned to their camp, somebody talked about a man amongst the companions of Allah's Messenger (ﷺ) who would follow and kill with his sword any pagan going alone. He said, "Nobody did his job (i.e. fighting) so properly today as that man." Allah's Messenger (ﷺ) said, "Indeed, he is amongst the people of the (Hell) Fire." A man amongst the people said, "I shall accompany him (to watch what he does)" Thus he accompanied him, and wherever he stood, he would stand with him, and wherever he ran, he would run with him. Then the (brave) man got wounded seriously and he decided to bring about his death quickly. He planted the blade of the sword in the ground directing its sharp end towards his chest between his two breasts. Then he leaned on the sword and killed himself. The other man came to Allah's Messenger (ﷺ) and said, "I testify that you are Allah's Messenger." The Prophet (ﷺ) asked, "What has happened?" He replied, "(It is about) the man whom you had described as one of the people of the (Hell) Fire. The people were greatly surprised at what you said, and I said, 'I will find out his reality for you.' So, I came out seeking him. He got severely wounded, and hastened to die by slanting the blade of his sword in the ground directing its sharp end towards his chest between his two breasts. Then he eased on his sword and killed himself." when Allah's Messenger (ﷺ) said, "A man may seem to the people as if he were practising the deeds of the people of Paradise while in fact he is from the people of the Hell) Fire, another may seem to the people as if he were practicing the deeds of the people of Hell (Fire), while in fact he is from the people of Paradise."
Narrated Sahl bin Sa`d As Saidi:
Allah's Messenger (and his army) encountered the pagans and the two armies.,, fought and then Allah's Apostle returned to his army camps and the others (i.e. the enemy) returned to their army camps. Amongst the companions of the Prophet (ﷺ) there was a man who could not help pursuing any single isolated pagan to strike him with his sword. Somebody said, "None has benefited the Muslims today more than so-and-so." On that Allah's Messenger (ﷺ) said, "He is from the people of the Hell-Fire certainly." A man amongst the people (i.e. Muslims) said, "I will accompany him (to know the fact)." So he went along with him, and whenever he stopped he stopped with him, and whenever he hastened, he hastened with him. The (brave) man then got wounded severely, and seeking to die at once, he planted his sword into the ground and put its point against his chest in between his breasts, and then threw himself on it and committed suicide. On that the person (who was accompanying the deceased all the time) came to Allah's Messenger (ﷺ) and said, "I testify that you are the Messenger of Allah." The Prophet (ﷺ) said, "Why is that (what makes you say so)?" He said "It is concerning the man whom you have already mentioned as one of the dwellers of the Hell-Fire. The people were surprised by your statement, and I said to them, "I will try to find out the truth about him for you." So I went out after him and he was then inflicted with a severe wound and because of that, he hurried to bring death upon himself by planting the handle of his sword into the ground and directing its tip towards his chest between his breasts, and then he threw himself over it and committed suicide." Allah's Messenger (ﷺ) then said, "A man may do what seem to the people as the deeds of the dwellers of Paradise but he is from the dwellers of the Hell-Fire and another may do what seem to the people as the deeds of the dwellers of the Hell- Fire, but he is from the dwellers of Paradise."
It is reported on the authority of Sahl b. Sa'd al-Sa'idi that there was an encounter between the Messenger of Allah (ﷺ) and the polytheists, and they fought (against one another). At the conclusion of the battle the Messenger of Allah (ﷺ) bent his steps towards his army and they (the enemies) bent their steps towards their army. And there was a person (his name was Quzman and he was one of the hypocrites) among the Companions of the Messenger of Allah (ﷺ) who did not spare a detached (fighter of the enemy) but pursued and killed him with the sword. They (the Companions of the Holy Prophet) said: None served us better today than this man Upon this the Messenger of Allah (ﷺ) remarked: Verily he is one of the denizens of Fire. One of the people (Muslims) said: I will constantly shadow him. Then this man went out along with him. He halted whenever he halted, and ran along with him whenever he ran. He (the narrator) said: The man was seriously injured. He (could not stand the pain) and hastened his own death. He placed the blade of the sword on the ground with the tip between his chest and then pressed himself against the sword and killed himself. Then the man (following him) went to the Messenger of Allah (ﷺ) and said: I bear testimony that verily thou art the Messenger of Allah, He (the Holy Prophet) said: What is the matter? He replied: The person about whom you just mentioned that he was one among the denizens of Fire and the people were surprised (at this) and I said to them that I would bring (the news about him) and consequently I went out in search of him till I (found him ) to be very seriously injured. He hastened his death. He placed the blade of the sword upon the ground and its tip between his chest and then pressed himself against that and killed himself. Thereupon the Messenger of Allah (ﷺ) remarked: A person performs the deeds which to the people appear to be the deeds befitting the dweller of Paradise, but he is in fact one of the denizens of Hell. And verily a person does an act which in the eyes of public is one which is done by the denizens of Hell, but the person is one among the dwellers of Paradise.