Hadith: Whoever carries weapons against us is not one of us

عن أبي موسى الأشعري رضي الله عنه عن النبي صلى الله عليه وسلم قال:
«مَنْ حَمَلَ عَلَيْنَا السِّلَاحَ فَلَيْسَ مِنَّا».
[صحيح] - [متفق عليه] - [صحيح البخاري: 7071]

Abu Mūsa al-Ash‘ari (may Allah be pleased with him) reported: The Prophet (may Allah’s peace and blessings be upon him) said:
"Whoever carries weapons against us is not one of us."
[Authentic hadith] - [Narrated by Bukhari & Muslim] - [Sahih Bukhari - 7071]

Explanation

The Prophet (may Allah's peace and blessings be upon him) warns against carrying weapons against Muslims to intimidate or rob them. Whoever does so unjustly has committed a serious crime and a major sin and deserves this stern warning.

Benefits from the Hadith

1. The Hadīth gives a stern warning against Muslims fighting one another.
2. One of the most mischievous acts on earth is to brandish weapons against Muslims and cause corruption by killing.
3. The warning in question does not apply to just fighting, such as fighting the oppressors, corruptors, and the like.
4. It is prohibited to scare Muslims with weapons and the like, even if done jokingly.