To glorify God three times, no matter what he commanded, and in his prostration, three, no more than what he commanded, and that is below, and his command is considered obligatory, and that is why some scholars, namely Ishaq bin Ibrahim bin Rahawayh, saw that this is obligatory and that it is one of the following. He did not say the tasbih three times while bowing and prostrating, and his prayer was not valid.