Sudhābhojanajātaka

Suttapiṭaka · Khuddakanikāya · Jātaka (2) · Vol. 28 · Section 251

[251] Vain is his oblation, and vain too is his striving, who, when a guest is seated, eats his food alone. Therefore I say to you, Kosiya: give gifts, and eat as well; ascend the path of the noble ones — one who eats alone gains no happiness.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places