The Tipiṭaka in Three Languages

Javanahaṁsajātaka

Suttapiṭaka · Khuddakanikāya · Jātaka (1) · Vol. 27 · Section 1757

[1757] Even though a man may think of another, "He is a kinsman, a friend, or a companion," one who before was well-disposed may afterwards turn into an enemy.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 1 other place