Narrated Abu Hurairah: The Prophet ﷺ said: Faith prevented assassination. A believer should not assassinate.
Explanation & Benefits
Shaykh Umar Farooq Saeedi
Benefits and Issues:
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That is, in matters of honor and dignity, a Muslim should not kill another Muslim through deception or negligence.
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A person with whom there is any covenant or agreement—killing such a person is also impermissible.
Except for those enemies with whom war has been declared and both parties are in a state of warfare—
in that case, this action is permissible.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 2769