The World Federation One Stop Fiqh

Ruling 690

The recommended precaution is that tayammum – whether it is in place of wuḍūʾ or in place of ghusl – should be performed in this manner: (1) the palms are struck on the ground once and are wiped over the forehead and the back of the hands; and (2) they are then struck again on the ground and are wiped over the back of the hands.