Nafi said: Accompanied by Abdullah bin Umar, I went to Ibn Abbas for a certain work. He (Ibn Abbas) narrated a tradition saying: A man passed by the Messenger of Allah صلی اللہ علیہ وسلم in a street, while he returned from the toilet or just urinated. He (the man) saluted him, but the Prophet did not return the salutation. When the man was about to disappear (from sight) in the street he struck the wall with both his hands and wiped his face with them. He then struck another stroke and wipes his arms. He then returned the man's salutation. Then he said: I did not return the salutation to you because I was not purified. Abu Dawud said: I heard Ahmad bin Hanbal say: Muhammad bin Thabit reported a rejected tradition. Ibn Dasah said: Abu Dawud said: No one supported Muhammad bin Thabit in respect of narrating this tradition as to striking the wall twice (for wiping) from the Prophet صلی اللہ علیہ وسلم, but reported it as an action of Ibn Umar.