Bhagwad Gita
Chapter 1, Verse 35
एतान्न हन्तुमिच्छामि घ्नतोऽपि मधुसूदन।
अपि त्रैलोक्यराज्यस्य हेतोः किं नु महीकृते।।1.35।।
These I do not wish to kill, O Krishna, even though they kill me, for the sake of dominion over the three worlds; leave alone killing them for the sake of the earth.