Milkhemet Mitzvah (Mitzvah War)
Milḥemet mitzvah or in Tiberian Hebrew milḥemeth miṣwah is the term for a war during the times of the Tanakh when a king would go to war in order to fulfill something based on, and required by, the Torah without needing approval from a Sanhedrin, such as war against Amalek, or the seven nations of Canaan. (Wikipedia)
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