The incident you are referring to is a popular story from Hindu mythology, specifically from the childhood of Lord Krishna. According to the legends, Yasodha Ma was Krishna's foster mother in Vrindavan. One day, when Krishna was a young child, he had been mischievously eating butter, curd, and other sweets without permission. Yasodha Ma noticed this and became curious about what Krishna was eating. She approached him and playfully asked him to open his mouth so she could see what was inside. In