Ruling 690 — Purification (Ṭahārah)

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