Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) said: "The worst thief among people is the one who steals from his prayer." They asked: How does he steal from his prayer? The Prophet (peace and blessings be upon him) said: "He does not perform its bowing (ruku') and its prostration (sujud) completely."