Bhagavad Gita 1.35

I would not kill them, even for three worlds; why then for this earth alone? It matters not if I myself am killed.

एतान्न हन्तुमिच्छामि घ्नतोऽपि मधुसूदन।
अपि त्रैलोक्यराज्यस्य हेतोः किं नु महीकृते॥

etānna hantumicchāmi ghnato'pi madhusūdana|
api trailokyarājyasya hetoḥ kiṃ nu mahīkṛte||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).