(15) باب إِثْمِ مَنْ دَعَا إِلَى ضَلاَلَةٍ أَوْ سَنَّ سُنَّةً سَيِّئَةً
Narrated `Abdullah:
The Prophet (ﷺ) said, "None is killed unjustly, but the first son of Adam will have a part of its burden." Sufyan said, "..a part of its blood because he was the first to establish the tradition of murdering"
Reference: Sahih al-Bukhari 7321
In-book reference: Book 96, Hadith 51
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 92, Hadith 423