Certainty about Wiping the Forehead and Back of the Hands
Issue No.651- In order to be sure that the forehead and the backs of the hands have been wiped entirely, one should include the surroundings of these parts slightly, but wiping between the fingers is not necessary. As an obligatory precaution, the forehead and the backs of the hands should be wiped from top to bottom, and the parts of tayammum should be performed consecutively, thus if a person leaves such a gap between them that tayammum loses its form, his tayammum is void.