A Salt Marchant and His Ass
Once upon a time a Salt Marchant lived in a village. He had an ass. He used to load salt bags on the back of the ass and went to the market. They had to cross a bridge to go to the market. One day, on their way the ass's legs slipped and he fell into the stream with the load. When he got out of the water he saw that his load had become lighter. The next day he Purposefully jumped into the water and the load became lighter. On the third day he did the same thing. But his master had understood his trick. He thought to teach the ass a lesson. He loaded the bags with cotton. On the way the ass again purposefully jumped into the water. And the cotton soaked the water and became havier. The ass then struggled to get out of the water. He realised his fault.
Moral.
You can fool a person only a few times not always. Or We shouldn't refrain from performing our duties.