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Thus, the Prophet, peace and blessings be upon him, instructed people to withdraw to a place where they would not fight and to render unusable the weapons used in such strife. He explained that a person acting under compulsion bears no sin. Since the fighting occurred amid strife, whoever killed him did so unjustly and thus bore both his own sin and that of his victim.
As for someone compelled to fight against a group whose cause is just—such as someone in the ranks of the disbelievers, apostates, or those who have departed from Islam—whoever kills him bears no sin. Rather, he is rewarded for engaging in jihad, even if it results in killing that person.
فقد امْر صلى الله عَلَيْهِ وَسلم بِالْهِجْرَةِ الى حَيْثُ لَا يُقَاتل وبإفساد السِّلَاح الَّذِي يُقَاتل بِهِ فِي الْفِتْنَة وَاخْبَرْ ان الْمُكْره لَا اثم عَلَيْهِ وَلما كَانَ الْقِتَال فِي الْفِتْنَة كَانَ قَاتله قَاتلا لَهُ بِغَيْر حق فباء بإثمه واثم صَاحبه
واما الْمُكْره الَّذِي يُقَاتل طَائِفَة بِحَق كَالَّذي يكون فِي صف الْكفَّار والمرتدين والمارقين من الاسلام فَلَا اثم على من قَتله بل هُوَ مثاب على الْجِهَاد وان افضى الى قَتله