Dhammapada · 14.6

Khantī paramaṃ tapo titikkhā, nibbānaṃ paramaṃ vadanti buddhā;Na hi pabbajito parūpaghātī, na samaṇo hoti paraṃ viheṭhayanto.

Khanti paramam tapo titikkha, nibbanam paramam vadanti buddha; Na hi pabbajito parupaghati, na samano hoti param vihethayanto.

Forbearing patience is the highest austerity; nibbana is supreme, say the Buddhas. He who harms another is no monastic, no recluse who harasses others.

— Dhammapada 14.6

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.