The Place of Prayer That Must Be Cleansed

Question
Is it established in the school of thought that cleansing the place of standing and the place where the forehead is placed is obligatory in prostration, and that cleansing the place of the hands and knees is a Sunnah? Is there a valid opinion regarding the obligation to cleanse the place of the hands and knees?
Answer
I say, and with God's success: what has been mentioned is the relied-upon view, and there are other opinions regarding the purity of the place of the hands and knees, but they are not considered valid. And God knows best.
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