Aesop's Fables (1884)
23. The Monkey and the Dolphin.
A Sailor, bound on a long voyage, took with him a Monkey to amuse him while on shipboard. As he sailed off the coast of Greece, a violent tempest arose, in which the ship was wrecked, and he, his Monkey and all the crew were obliged to swim for their lives. A Dolphin saw the Monkey contending with the waves, and supposing him to be a man (whom he is always said to befriend), came and placed himself under him, to convey him on his back in safety to the shore. When the Dolphin arrived with his burden in sight of land not far from Athens, he demanded of the Monkey if he were an Athenian, who answered that he was, and that he was descended from one of the noblest families in that city.
The Dolphin then inquired if he knew the Piræus (the famous harbor of Athens). The Monkey, supposing that a man was meant, and being obliged to support his previous lie, answered that he knew him very well, and that he was an intimate friend, who would, no doubt, be very glad to see him. The Dolphin, indignant at these falsehoods, dipped the Monkey under the water, and drowned him.
He who once begins to tell falsehoods is obliged to tell others to make them appear true, and, sooner or later, they will get him into trouble.
Aesop's Fables: A New Revised Version From Original Sources (translator not identified), 1884 . Illustrations by Ernest Henry Griset (1844-1907), John Tenniel (1820-1914) and Harrison Weir (1824-1906). Available online at Project Gutenberg.