Between the one who hears the sermon and the one who does not hear it. If he hears, he listens, and if he does not hear, it is permissible for him to recite the tasbih or speak on a matter of knowledge and the public, provided that if he speaks, his prayer is not invalidated. It was narrated on the authority of Ibn Wahb that he said: Whoever cancels his prayers, his prayers are four noon. As for those who say that it is obligatory to listen They are the majority, so they were divided into three groups. One group permitted saying salaams and returning the greeting at the time of the sermon. This is what Al-Awza’i and Al-Thawri said. Among them were those who did not permit returning the greeting or saying the salaam. Some of them differed and said they should return the greeting and not gloat.