Canonical Reference: Dhp 5 Verified Source

“Hatred is never appeased by hatred in this world. By love and non-hatred alone is hatred appeased. This is an eternal law.”

— Gautam Buddha
The Awakened One, Founder of Dhamma
Historical Setting & Context:

Pali Canon: Dhammapada 1.5 (Na hi verena verāni sammantīdha kudācanaṁ, Averena ca sammanti esa dhammo sanantano).