Chapter 2 · The Yoga of Knowledge · Krishna said
Bhagavad Gita 2.21 — Knowing the eternal soul
वेदाविनाशिनं नित्यं य एनमजमव्ययम्। कथं स पुरुषः पार्थ कं घातयति हन्ति कम् ॥
vedāvināśinaṃ nityaṃ ya enamajamavyayam | kathaṃ sa puruṣaḥ pārtha kaṃ ghātayati hanti kam ||
Meaning
Partha, how can a person who knows the soul to be indestructible, eternal, unborn and unchanging kill anyone or cause anyone to be killed?