Once upon a time, a man bought a big cow and a calf. When he came home, he found that Daniel was too old to work, so he sharpened his knife and killed the old cow. After grinding the knife, he was busy for a while and came back to kill the old cow. But the sharpened knife is gone, and he can't find it anywhere. Later, when he saw the calf vomiting blood there, he knew he was going to kill his mother and ate it. He was very moved and became a monk.