It is recorded in Sahih Muslim that Prophet Muhammad (PBUH) said:
“He who points a weapon towards his brother,the angels invoke curse upon him even if he is his real brother so long as he does not abandon it (use of weapon)”.
Thus, Islam prohibits harming civilians, either by hitting, killing or any kind of harming or terrorizing through use of the weapon.
Great hadith scholar, Imam Al-Nawawi explains: “This hadith underscores the inviolability of lives and the absolute prohibition of terrorizing, frightening or harming them.
Prophet (PBUH) said: “if he is his real brother”. This is an emphasis on the comprehensiveness of prohibition to include all people and all cases; whether they are expected to commit crimes against them or not, and whether it is done intentionally or unknowingly. This is because one may lose control of the arm at any moment.” It is recorded in Sunan Abu Dawud that Prophet (PBUH) said, “It is not lawful for a Muslim to frighten others”.
This applies simply to the prohibition of pointing a weapon towards others and terrorizing them. So what about the one who kills his fellow Muslim or even frighten him. The one who does these acts is, fights Allah and his Messenger and spreads corruption on earth and thus deserves the punishment of the oppressors in this world and grave torment in the hereafter.
Allah, the Almighty, says, “Indeed, the penalty for those who wage war against Allah and His Messenger and strive upon earth [to cause] corruption is none but that they be killed or crucified or that their hands and feet be cut off from opposite sides or that they be banished from the land. That is from them a disgrace in this world; and for them in the Hereafter is a great punishment.” (The Quran, 5:33)
In his Farewell sermon, Prophet Muhammad (PBUH) highlighted the sacredness of people’s lives and blood in order to preserve people’s stability and security, as recorded in Sahih Al-Bukhari:
“Verily your blood, your property and your honor are as sacred and inviolable as the sanctity of this day of yours, in this month of yours and in this town of yours. Verily! I have conveyed this message to you.”
Whoever carries weapons against us with the aim of frightening, killing or terrorizing us is, in fact, not following our way or religion. It is narrated on the authority of Abdullah Ibn ‘Umar, may Allah be pleased with them both, that Prophet Muhammad (PBUH) said, “whoever carries arms against us, is not one of us.”