Sumaṅgalajātaka

Suttapiṭaka · Khuddakanikāya · Jātaka (1) · Vol. 27 · Section 1147

[1147] And when he knows the clarity (pasāda) of his own mind, let him apply himself to the matter — the wrong that another has done; when he has seen for himself, "This is indeed the case," then let him impose upon that person a commensurate penalty.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.