Amr bin Shu'aib narrates from his father, who narrates from his grandfather: The Prophet Muhammad (peace be upon him) said: "Order your children to pray when they are seven years old, and beat them for (neglecting) it when they are ten years old, and separate their beds. And when a person marries his slave or servant to his maidservant, the maidservant should not look at his private parts, for the area between the navel and the knees is 'awrah (private)."