Bhagavad Gita · 2.19

य एनं वेत्ति हन्तारं यश्चैनं मन्यते हतम्।उभौ तौ न विजानीतो नायं हन्ति न हन्यते॥

ya enaṁ vetti hantāraṁ yaśh chainaṁ manyate hatam ubhau tau na vijānīto nāyaṁ hanti na hanyate

One who thinks the soul can kill and one who thinks it can be killed — both are ignorant. The soul neither kills nor is killed.

— Bhagavad Gita 2.19

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)