The concept of "occupation" (iḥtilāl) in Islamic political jurisprudence and its confrontational approaches - particularly regarding Palestine, Syria, and Lebanon - has been a subject of scholarly debate requiring further elaboration. In this context, occupation refers to a state wherein a hostile enemy seizes control over part or all of a territory through overt aggression. This study focuses on Imam Ali's (AS) Nahj al-Balāgha, particularly the Khutbat al-Jihād, to analyze his stance toward occupation. Employing a descriptive-analytical method and drawing on primary sources, this research investigates Imam Ali's (AS) conduct in resisting occupation. The study concludes that two core elements define occupation in Imam Ali's (AS) teachings: the systemic oppression of a land's people, and the enemy's domination over all or part of an Islamic territory. Imam Ali's (AS) approach - evidenced by his critique of Iraqis' passivity during Anbar's occupation by Syrian forces emphasizes pre-emptive action against imminent threats, the divine philosophy of jihad's legislation, condemnation of those who abandon combat duties, and awakening communal zeal and conscience. These principles collectively embody a strategy of ‘resistance and steadfastness’ against occupation. This perspective is further corroborated by the conduct of Imami jurists (Shiite scholars), solidifying its legitimacy within Islamic thought.