Abu Yusuf and Muhammad require contact of the forehead in the absence of an excuse; the words illa min udhr provide the exception. A condition making forehead contact impossible can affect the ruling.
Their reasoning emphasizes narrations on the seven parts and the forehead. Al-Shafi‘i likewise requires prostration on the forehead, with separate details regarding the nose.
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Ruku, Qawmah, Sujud and the Sitting Between Prostrations
Abu Yusuf and Muhammad require contact of the forehead in the absence of an excuse; the words illa min udhr provide the exception. A condition making forehead contact impossible can affect the ruling.
Their reasoning emphasizes narrations on the seven parts and the forehead. Al-Shafi‘i likewise requires prostration on the forehead, with separate details regarding the nose.