Perform Tayammum to return greetings

 167. Umar, the freed slave of Ibn Abbas said: I and ´Abdullah bin Yasar, the freed slave of Maimunah, the wife of the Prophet salla alayhi wa sallam, came to the house of Abu Juhaim bin Harith bin Simmah Ansari and he said: ´´The Messenger of Allah salla alayhi wa sallam came from the firection of Bi´r Jamal, when a man met him. He greeted him but the Messenger of Allah salla alayhi wa sallam did not return his greeting until he came to a eall, and wiped his face and hands and then returned his greeting.´´