The Bhagavad Gita

य एनं वेत्ति हन्तारं यश्चैनं मन्यते हतम् | उभौ तौ न विजानीतो नायं हन्ति न हन्यते ||२-१९||

He who takes the Self to be the slayer and he who thinks It is slain, neither of them ï1knowsï1. It slays not, nor is It slain.

In this verse, Lord Krishna tells Arjuna that people who believe the soul can kill or be killed are fundamentally mistaken about reality. He explains that the true Self (Atman) is eternal and indestructible, meaning it exists beyond physical birth and death. Therefore, no one truly slays another person's essence, nor does any part of a living being ever cease to exist simply because their body dies.