He عليه السلام, peace be upon him, clarified in this report that whoever does not know what he has prayed is obligated to repeat the prayer, as we have previously mentioned. Moreover, in the first two reports, there is what prevents relying upon them, namely, the hadith of Dhu al-Shimalayn and the forgetfulness of the Prophet (peace be upon him and his family), and this is something that reason rejects. As for the other report, which we used as supporting evidence for the first two, containing the statement: "We spoke to each other, and they spoke to me", this does not contradict what we have mentioned, namely that whoever speaks deliberately during prayer must repeat the prayer, for two reasons. First: the report does not state whether he spoke deliberately or out of forgetfulness, so we interpret it as being due to forgetfulness. Second: even if the report had clearly stated that it was deliberate, it would still be possible that what was meant is that he had performed the taslim out of forgetfulness and thought that this permitted speaking, just as it is permitted after the completion of prayer. Therefore, he would not be obligated to repeat the prayer due to his ignorance of the ruling and his lack of knowledge that such speech was not allowed. As for what was narrated:
Commentary #4