Once there lived a white louse in the clean white bed of a palace. When the king slept on that bed, the louse would bite him and fill his stomach. One day a bedbug came from somewhere. When the louse saw the bedbug he said, “Where did you come from? Please leave before anyone sees you here.” The bedbug replied, “Why are you speaking to me like this? I have bitten many humans in my life, but never a King. I want to bite the King and experience how it tastes.”  The louse said, “I bite the king after he is fast asleep. However you are fickle. If you want to bite the king, then you must wait till he is asleep and I have already had my share of feed from him.”  The bedbug said, “I will do as you say. I will wait till you are done and then only I will bite him.”  While they were talking like this, the king came there and lay down on the bed. The bedbug could not control himself and bit him as soon as he laid down.  The king jumped from his bed and asked the servants to look for what insect had bitten him.  The servant started to carefully examine the bedsheet, while the bedbug quickly hid inside a joint on the bed. The servants found the louse trying to hide under the crease on the bed sheet and killed him.  That is why it is said that one should not offer shelter to someone without knowing their true nature.