Kokilavagga

Suttapiṭaka · Khuddakanikāya · Jātaka (1) · Vol. 27 · Section 622

[622] "Whoever, when the time has not arrived, speaks on beyond the proper time — even so he lies struck down, like the cuckoo's own offspring."

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.