Dhammapada · 9.3
Puññañce puriso kayirā, kayirāthetaṃ punappunaṃ;Tamhi chandaṃ kayirātha, sukho puññassa uccayo.
Punnance puriso kayira, kayirathetam punappunam; Tamhi chandam kayiratha, sukho punnassa uccayo.
If a person does good, let them do it again and again, and take delight in it. Happy is the accumulation of merit.
— Dhammapada 9.3
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.