The Prophet (may Allah's peace and blessings be upon him) pointed out that the worst thief among people is the one who steals from his prayer. This is because when a person takes the money of others, he may utilize it in worldly life, unlike this thief, who steals his share of the reward. They said: O Messenger of Allah, how does he steal from his prayer? He said: He does not perform its Rukū 'or prostration perfectly; he bows and prostrates himself in haste, so he does not perform them correctly.