"So turn away from them," meaning: turn away from them, and this was before he was commanded to fight them. "You are not to be blamed" for the proof; for you have established it against them.
﴿فتول عَنْهُم﴾ أَي: فَأَعْرض عَنْهُم، وَهَذَا قبل أَن يُؤمر بقتالهم ﴿فَمَا أَنْتَ بملوم﴾ فِي الحجَّةِ؛ فقد أقمتها عَلَيْهِم