What is the ruling on one who interrupts the imam with words other than tasbih? And does the prayer of the one who speaks become invalid?

The Shaykh : Yes, exactly.

Another questioner: Shaykh, in the middle of the prayer, you say, for example, that a person read through the surah without reading al-Fatihah before it, meaning he did not read al-Fatihah but read the surah immediately?

The Shaykh: The same answer, my brother.

The questioner: It is permissible for you to say to him, "Do you remember al-Fatihah?" because he did not read al-Fatihah.

The Shaykh: No.

The questioner: One person said, instead of reading al-Fatihah, he said: .

The Shaykh: Understood, understood, understood. May Allah reward you. It is not permissible for the one praying or the follower to say to the imam a word that conveys a meaning, but rather as he (peace and blessings be upon him) said in Sahih al-Bukhari: He says, "Glory be to Allah." Then it is not your concern whether he is alerted or not, because many imams do not get alerted; they stand for the fifth rak'ah, and those behind them say, "Glory be to Allah" from here, "Glory be to Allah" from there, and he does not know what it is about. But later, when he says the taslim, he is told, "You prayed five," so the matter is rectified, or "You prayed three," so he stands and makes up the fourth, and so on. Therefore, it is not permissible for the follower to speak with words; he should only say, "Glory be to Allah."

The questioner: Does his prayer become invalid, Shaykh?

The Shaykh: Which prayer?

The questioner: Does the prayer of this one become invalid?

Another questioner: The one who spoke?

The questioner: The one who spoke.

The Shaykh: Ah, here comes the well-known disagreement among the jurists regarding the speech of the forgetful person and the ignorant person: does it invalidate the prayer or not? There are two schools of thought. The Hanafi school says it invalidates the prayer. The Shafi'i school, which is the correct position, says it does not invalidate it, based on the hadith of Mu'awiyah ibn Hukam al-Sulami, who responded to the sneeze of the person next to him and said to him, "May Allah have mercy on you." Then the situation became more confusing than that, as they were looking at him with the corners of their eyes, so he shouted at the top of his voice, "Woe to your mother! Why are you looking at me?" At that point, the Companions realized that this was a man who had recently embraced Islam and did not know what is permissible and what is not permissible in prayer. So they began hitting their thighs to silence him. Then, when the Messenger of Allah (peace and blessings be upon him) turned toward him, he was afraid that he would come and rebuke him. But as you know from the description of Allah in the Noble Qur'an, in truth, He said, "So the Messenger of Allah (peace and blessings be upon him) turned toward me, and by Allah, he did not humiliate me, nor did he strike me, nor did he insult me, but he only said to me: He did not order him to repeat the prayer because he was ignorant.
The ignorant person and the forgetful person do not have their prayer invalidated. But we mention that it is not permissible for one who sees an error by the imam to remind him except with something like "Glory be to Allah." This is if it is an actual error. But if it is an error in the Qur'an, he should prompt him with the verse, guiding him to the verse in the correct manner. These are the rulings related to prayer.