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Abu Huraira, may Allah be pleased with him, reported that the Messenger of Allah ( may the peace and blessings of Allah be upon him ) said:
“None amongst you should point a weapon towards his brother, for he does not know that Satan might cause the weapon (to slip) from his hand and (he may injure anyone) and thus he may fall into Hell-Fire.”
The Prophet ( may the peace and blessings of Allah be upon him ) taught his companions to be cautious about any thing that may harm the religious commitment, the soul, the offspring, the mind or the wealth. These are the five necessities that Muslims must preserve by the lawful means.
The Prophet ( may the peace and blessings of Allah be upon him ) used to desicpline them with the etiquette of the Holy Quran, such as to respects the Muslim brothers, to avoid the matters that he dislikes, or the words that he considers to be a sort of abuse, indifference or hurting his feelings.
The Prophet ( may the peace and blessings of Allah be upon him ) said: " None amongst you should point a weapon towards his brother." meaning that none of you shall point to his brother with a weapon even if he is joking. It is enough foolishness to point to a Muslim brother with a weapon. The wise shall abstain from this matter for the undesirable results; he may affect his brother with this weapon, he may think that his friend wants to kill him so he hits him sudenly to end his life, pointing with the weapon may provoke hostility between them, perhaps his family members would rush to fight the one who holds the weapon so that it will be the spark that set fire to the fuel, none is aware of its extent but Allah.
The same ruling applies for everything that frightens or harms the believer; Islam is based on the absolute justice and to avoid causing harming to the soul or wealth.
Anyone who contemplates the teachings of Islam, he will confirm that its rules are based on justice, virtue and mutual respect between people.