The ass1 and the fox, having entered into partnership2 together fortheir mutual3 protection, went out into the forest to hunt. Theyhad not proceeded far when they met a lion. The fox, seeingimminent danger, approached the lion and promised to contrive4 forhim the capture of the ass if the lion would pledge his word notto harm the fox. Then, upon assuring the ass that he would notbe injured, the fox led him to a deep pit and arranged that heshould fall into it. The lion, seeing that the ass was secured,immediately clutched the fox, and attacked the ass at hisleisure. 
Never trust your enemy. 