Bhagavad Gita 2.19

य एनं वेत्ति हन्तारं यश्चैनं मन्यते हतम् |
उभौ तू न विजानितो नयं हन्ति न हन्यते

Translation

Neither of them is in knowledge—the one who thinks the soul can slay and the one who thinks the soul can be slain. For truly, the soul neither kills nor can it be killed.