Dhammapada · 26.7

Na brāhmaṇassa pahareyya, nāssa muñcetha brāhmaṇo;Dhī brāhmaṇassa hantāraṃ, tato dhī yassa muñcati.

Na brahmanassa pahareyya, nassa munchetha brahmano; Dhi brahmanassa hantaram, tato dhi yassa munchati.

One should not strike a brahmin, nor should the brahmin let loose his anger against the striker. Shame on him who strikes a brahmin; greater shame on the brahmin who strikes back.

— Dhammapada 26.7

Source: Pali text from the Khuddaka Nikāya of the Pali Canon (oldest extant Buddhist scripture, compiled c. 3rd century BCE). Public-domain English readings drawn from F. Max Müller's translation in Sacred Books of the East, Vol X (1881) and the Buddhist Publication Society's freely-licensed Acharya Buddharakkhita rendering.