Muqatil (may Allah have mercy on him) said: I took this tafsir from a group of people; of them, Mu'adh (bin Musa, the narrator) remembered Mujahid, al-Dahhak and al-Hasan (may Allah have mercy on them). Then he narrated the previous report, except that it does not contain the words that there were vendettas and killings between them.
Imam al-Shafi'i (may Allah have mercy on him) said: This is the more likely view, for Allah Almighty has held each sinner answerable for his own sin and has not placed its consequence on another. Then he spoke at length, until he said that the Prophet (peace and blessings be upon him) said: "The person most detested by Allah is the one who leaves the killer and has someone else killed in his place."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15892