Hazrat Mujahid says that Hazrat Ibn Abbas (may Allah be pleased with them) said { فَکَأَنَّمَا قَتَلَ النَّاسَ جَمِیعًا } Translation: It is as if he has killed all of humanity. He said: Whoever killed him. { وَمَنْ أَحْیَاہَا فَکَأَنَّمَا أَحْیَا النَّاسَ جَمِیعًا } And whoever kept him alive, it is as if he refrained from killing all of humanity.