Hadith on Bloodshed: Worst tyrants kill those who do not fight

Abu Shuraih reported: The Messenger of Allah, peace and blessings be upon him, said, “Verily, the most tyrannical of people to Allah Almighty is he who kills those who did not fight him, or he demands the blood feuds of ignorance be settled by the people of Islam, or he claims his eyes have seen in a dream what they did not see.

Source: Musnad Aḥmad 15943

Grade: Rijal al-Sahih (narrators are reliable) according to Al-Haythami

عَنْ أَبِي شُرَيْحٍ الْخُزَاعِيِّ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ إِنَّ مِنْ أَعْتَى النَّاسِ عَلَى اللَّهِ عَزَّ وَجَلَّ مَنْ قَتَلَ غَيْرَ قَاتِلِهِ أَوْ طَلَبَ بِدَمِ الْجَاهِلِيَّةِ مِنْ أَهْلِ الْإِسْلَامِ أَوْ بَصَّرَ عَيْنَيْهِ فِي النَّوْمِ مَا لَمْ تُبْصِرَا

15943 مسند أحمد أول مسند المدنيين رضي الله عنهم أجمعين

7/177 المحدث الهيثمي خلاصة حكم المحدث رجاله رجال الصحيح في مجمع الزوائد