2:21  

वेदाविनाशिनं नित्यं य एनमजमव्ययम् ।
कथं स पुरुषः पार्थ कं घातयति हन्ति कम् ॥२- २१॥

wedaawinaashinaM nityaM ya enamajamawyayam ।

kathaM sa puruShaH paartha kaM ghaatayati hanti kam ॥२- २१॥

Source: Automatic ITRANS Transliteration

The man who knows this indestructible, eternal, unborn, immutable,
How, whom does he slay, O son of Pritha? Who are killed?

Source: Milind S. Pandit

O Arjuna, how can a person who knows that the Atma is indestructible, eternal, unborn, and imperishable, kill anyone or cause anyone to be killed?

Source: The Bhagavad-Gita: The Sacred Song

O Partha, how can a person who knows that the soul is indestructible, unborn, eternal and immutable, kill anyone or cause anyone to kill?

Source: Bhagavad Gita As It Is