In the oldest versions, a lion threatens a mouse that wakes him from sleep. The mouse begs forgiveness and makes the point that such unworthy prey would bring the lion no honor. The lion then agrees and sets the mouse free. Later, the lion is netted by hunters. Hearing it roaring, the mouse remembers its clemency and frees it by gnawing through the ropes. The moral of the story is that mercy brings its reward and that there is no being so small that it cannot help a greater.
