The Cock and the Fox
The Fox, passing early one summer's morning near a farm-yard, was caught in a springe, which the farmer had planted there for that end. The Cock, at a distance, saw what happened, and, hardly yet daring to trust himself too near so dangerous a foe, approached him cautiously, and peeped at him. Reynard addressed himself to him, with all the designing artifice imaginable. "Dear cousin," says he, "you see what an unfortunate accident has befallen me here, and all upon your account: for, as I was creeping through yonder hedge, in my way homeward, I heard you crow, and was resolved to ask you how you did before I went any farther; but I met with this disaster; and therefore now I must ask you for a knife to cut this string; or, at least, to conceal my misfortune till I have gnawed it asunder." The Cock, seeing how the case stood, made no reply, but posted away as fast as he could, and told the farmer, who came and killed the Fox.
To aid the vicious is to become a partner in their guilt.