“Abu ‘Abd Allah (a.s.), has said that once a woman was brought before ‘Umar who was married to an old man who when going to bed with her had died on her belly. When she gave birth to a boy, his sons claimed that she has committed fornication and presented testimony against her. ‘Umar commanded to stone her to death. Ali (a.s.), passed by and she said, ‘O son of the uncle of the Messenger of Allah, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, I have a proof.’ He (the Imam) said, ‘Show it to me.’ She give a document to him (the Imam) and he read it and said, ‘This woman is informing you about the day she became married, the day she went to bed and how the sexual intercourse took place. You must return the woman back.’ The next day he called the children of the same age along with the disputed child and asked them to play until they were tired. He (the Imam) told them to sit down until they had taken their places, then he (the Imam) called them to get up. The children stood up but the (disputed) child when getting up had to support himself by placing both of his palms on the ground. Ali (a.s.), then made him to inherit his father and whipped his brothers one by one of falsely accusing his mother. ‘Umar then asked him (the Imam), ‘How did you do it?’ He (the Imam) said, ‘I found out the weakness of the old man in the boy’s seeking support from his palms when getting up to stand upright.’”