It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that once the Noble Prophet (peace and blessings be upon him) led us in the Asr prayer and after praying two rak'ahs, he said salam. Upon this, Dhul-Yadain stood up and said, "O Messenger of Allah (peace and blessings be upon him), did you forget or were the rak'ahs of the prayer reduced?" The Noble Prophet (peace and blessings be upon him) said, "I have neither forgotten nor have the rak'ahs of the prayer been reduced." He said, "Something has happened." Then the Noble Prophet (peace and blessings be upon him) asked the companions (may Allah be pleased with them), "Is it as Dhul-Yadain is saying?" The companions (may Allah be pleased with them) affirmed it. Upon this, the Noble Prophet (peace and blessings be upon him) performed the two rak'ahs that had been left out. And after saying salam, while sitting, he performed two prostrations of forgetfulness (sajda sahw).