Dhammapada · 22.7

Yaṃ kiñci sithilaṃ kammaṃ, saṃkiliṭṭhañca yaṃ vataṃ;Saṅkassaraṃ brahmacariyaṃ, na taṃ hoti mahapphalaṃ.

Yam kinci sithilam kammam, samkilitthanca yam vatam; Sankassaram brahmacariyam, na tam hoti mahapphalam.

Whatever action is slack, whatever vow is defiled, whatever holy life is followed with doubts — that does not bear great fruit.

— Dhammapada 22.7

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.