Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates about the Noble Prophet (peace and blessings be upon him): He led five rak'ahs in the Zuhr prayer. It was submitted to him: Has there been an addition in the prayer? He said: What has happened? The people said: You have led five rak'ahs. So the Noble Prophet (peace and blessings be upon him) performed two prostrations of forgetfulness (sajda sahw) after concluding the prayer with salam.