This traditions has also been narrated by Muhammad bin Muslim al-Zuhr through a different chain of transmitters and to the same effect. This version adds; He should perform two prostrations before giving the salutation.

Narrated Ata ibn Yasar: The Prophet صلی اللہ علیہ وسلم said: When one of you is in doubt about his prayer, and does not know how much he has prayed, three or four rak'ahs, he should pray one (additional) rak'ah and make two prostrations while sitting before giving the salutation. If the (additional) rak'ah which he prayed is the fifth one, he will make it an even number by these two prostrations. If it is the fourth one, the two prostrations will be a disgrace for the devil.

Narrated Abdullah ibn Buhaynah: The Messenger of Allah صلی اللہ علیہ وسلم led us in prayer praying two rak'ahs. When he stood up and did not sit (at the end of two rak'ahs) the people stood up along with him. When he finished the prayer and we expect him to give the salutation, he said: "Allah is most great. " While sitting and made two prostrations before giving the salutation. Then he gave it.