“They that with speech inopportune,” etc.—This story was told by the Master at Jetavana about Kokālika. The introductory story is told in full in the Takkārika Birth. 1
Once upon a time when Brahmadatta was reigning in Benares, the Bodhisatta was his valued minister. Now the king was very talkative. Thought the Bodhisatta, “I will put an end to his talkativeness,” and went about looking for an apt illustration. So one day the king came to his garden and sat down on the royal slab of stone. Above his head was a mango tree and there in a crow’s nest a black cuckoo had laid her egg and gone off. The female crow watched over that cuckoo’s egg. By and bye a young cuckoo came forth from it The crow thinking it was her own offspring took care of it, bringing food for it in her beak. The young bird while still unfledged uttered a cuckoo cry prematurely. The crow thought, “This young bird even now utters a strange note.  What will it do, when it is older?” And so she killed it by pecking it with her beak and threw it out of the nest, and it fell at the king’s feet. The king asked the
[paragraph continues] Bodhisatta, “What is the meaning of this, my friend?” Thought the Bodhisatta, “I am seeking for an illustration to teach the king a lesson, and now I have got one.” So he said, “Garrulous folk, Great King, who talk too much out of season, meet with a fate like this. This young cuckoo, sire, being fostered by the crow, while yet unfledged, uttered a premature cry. So the crow knew it was not her offspring and killed it by pecking it with her beak and threw it out of the nest. All those that are too talkative out of season, be they men or beasts, suffer like trouble.” And with these words he recited these stanzas:
They that with speech inopportune offend
Like the young cuckoo meet untimely end.
Nor deadly poison, nor sharp-whetted sword
Is half so fatal as ill-spoken word.
The sage his measured words discreetly guides,
Nor rashly to his second self confides:
Before he speaks will prudent counsel take,
His foes to trap, as Garuḍa the snake.
 The king, after hearing the religious teaching of the Bodhisatta, thenceforth became more measured in his words, and increasing the glory of the Bodhisatta ever gave him more and more.
The Master, having brought his lesson to an end, identified the Birth: “Kokālika in those days was the young cuckoo, and I myself was the wise minister.”
68:1 No. 481. Compare No. 215, Vol. ii.