Explanation

The meaning in a few plain lines

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.