It is narrated from Sayyiduna Ubayy ibn Ka'b (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) led the people in prayer and, by mistake, omitted a verse. Afterwards, the Prophet (peace and blessings be upon him) asked: "Did any of you notice my mistake in the recitation?" Sayyiduna Ubayy (may Allah be pleased with him) replied: "Yes, O Messenger of Allah! I realized it; you left out such-and-such verse." The Messenger of Allah (peace and blessings be upon him) said: "I knew that if anyone would notice it, it would be you."