It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) led five rak'ahs in the Zuhr prayer. Someone asked: "Has the prayer been increased?" Someone said: "You have led five rak'ahs." Therefore, the Prophet (peace and blessings be upon him) performed two prostrations.

(Second chain) The Noble Prophet (peace and blessings be upon him and his family) led the people in five rak‘ahs, and after saying salam, he turned and sat facing them. Some people began to speak secretly among themselves. Then they said, "O Messenger of Allah! You have led five rak‘ahs." The Prophet (peace and blessings be upon him and his family) turned back, performed two prostrations, said salam, and said: "I am only a human being; just as you forget, I also forget."

(Third chain) Sayyiduna Abdullah said that the Noble Prophet (peace and blessings be upon him) performed prostrations after the salutation, and on one occasion said: Indeed, the Noble Prophet (peace and blessings be upon him) performed two prostrations after the salutation due to forgetfulness.

(Fourth chain) It is narrated from Sayyiduna Abdullah (may Allah be pleased with him), he says: The Noble Prophet (peace and blessings be upon him) led five rak'ahs in the Zuhr or Asr prayer, and then performed two prostrations of forgetfulness (sahw), and after that, the Prophet (peace and blessings be upon him) said: These two prostrations are for the person who thinks that he has made an addition or a deficiency.

(Fifth chain) The Messenger of Allah, peace and blessings be upon him, forgot during the prayer, then after speaking, he performed two prostrations of forgetfulness.