The Tipiṭaka in Three Languages

Rurumigajātaka

Suttapiṭaka · Khuddakanikāya · Jātaka (1) · Vol. 27 · Section 1850

[1850] Easily understood is the cry of jackals and of birds; the utterance of human beings, O king, is harder to understand than that. Even if a person thinks, "He is a relative, a friend, or a companion," one who before was well-disposed afterwards becomes an enemy.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places