Habib bin Abi Thabit narrates that while Hajjaj was delivering a sermon and Sayyiduna Ibn Umar (may Allah be pleased with them both) was also present, with his two sons sitting to his right and left, Hajjaj said, "Ibn al-Zubair has bent the Book of Allah, the Noble Qur'an; may Allah overturn his heart." Habib said that Sayyiduna Ibn Umar (may Allah be pleased with them both) was attentive to him, so Sayyiduna Ibn Umar (may Allah be pleased with them both) said, "This matter is not in your or his control." The narrator said that Hajjaj became silent. Then he said, "Indeed, Allah Almighty has granted us and every Muslim knowledge. O old man, you too should use your intellect." So Sayyiduna Ibn Umar (may Allah be pleased with them both) began to laugh. Then this incident was narrated by Asim from Habib, so he said, "Then Sayyiduna Ibn Umar (may Allah be pleased with them both) leapt (towards Hajjaj), but his sons made him sit down." He said, "Let me go, for I have not yet said the real virtuous thing to him, that you (Hajjaj) are a liar."

The statement regarding the command to base it on investigation and inquiry when his heart inclines more towards a certain number, and he predominantly thinks that the number his heart inclines towards is the number of prayers he has performed.

Sayyiduna Abdullah bin Mas’ud (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings of Allah be upon him) led us in prayer, and in that prayer he either added something or omitted something. Then the Messenger of Allah (peace and blessings of Allah be upon him) turned his blessed face towards us. We said,“O Messenger of Allah, has there been some change in the prayer?”The Messenger of Allah (peace and blessings of Allah be upon him) asked,“What (change) is that?”So we informed the Messenger of Allah (peace and blessings of Allah be upon him) about what he had done. Therefore, the Messenger of Allah (peace and blessings of Allah be upon him) bent his foot, faced the qiblah, and performed prostrations. Then, turning towards us, he said:“If there had been any change in the prayer, I would have informed you. But I am a human being; I forget just as you forget. So if I forget, remind me. And if any one of you is uncertain about his prayer (whether he has added or omitted), he should reflect on what is most likely correct, then complete his prayer accordingly, then say the salam and perform two prostrations.”This is the narration of Abū Mūsā from ‘Abdur Rahman. Abū Mūsā says that Ibn Mahdi said: I asked Imam Sufyan about this, and he said, I heard this narration from Mansur, but I do not remember it. Ahmad bin ‘Abdah, in his narration, did not mention the words“al-taharrī”(investigation and seeking certainty), and said: If any one of you forgets in his prayer and does not know how much he has prayed, then after saying the salam, he should perform two prostrations of forgetfulness. Imam Abu Bakr (may Allah have mercy on him) says: This hadith is evidence that when the praying person completes his prayer based on investigation and seeking certainty, he should perform the two prostrations of forgetfulness after the salam, and this is my position. And when he bases it on the minimum number, then he should perform the two prostrations of forgetfulness before the salam, as is in the narration of Sayyiduna Sa’id Khudri (may Allah be pleased with him). In my view, it is not correct or permissible to reject one narration with another; rather, it is obligatory to act upon each narration in its proper place.“Al-taharrī”(investigation and seeking certainty) is when the heart of the praying person inclines more towards one number, while the issue of basing on the minimum number is different from the issue of investigation. Therefore, it is obligatory to act upon both narrations as they have been stated.

And when the person praying stands up straight, he should continue the prayer; two prostrations of forgetfulness are obligatory upon such a person.

Sayyiduna Ibn Buhayna (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) led us in prayer—we think it was the ‘Asr prayer—then when he was in the second rak‘ah, he stood up and did not sit (for tashahhud, but stood up). Then, before saying the salam (while sitting for tashahhud), the Messenger of Allah (peace and blessings be upon him) performed two prostrations of forgetfulness while sitting.

Sayyiduna Abdullah bin Buhaina (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) led us in one of the prayers, and in the second rak‘ah he stood up (without sitting for tashahhud). He was reminded by saying "Subhan Allah," but he continued with his prayer until he finished it and only the salam was left. So, before the salam, he performed two prostrations while sitting.

Then he should be alerted by saying "Subhanallah" that he forgot to sit for Tashahhud, so he should continue his prayer and, after standing up, should not sit down again, and before saying the Salam, he should perform two prostrations.

Sayyiduna Ibn Buhaynah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) led us in prayer, then narrated the rest of the hadith. Yahya bin Hakim, in his narration, mentions these words: So we reminded the Prophet (peace and blessings be upon him) by saying "Subhanallah," but when he stood up straight, he continued the prayer and did not return (did not sit down). In the narration of Janab Fadl, it is mentioned: They tried to draw the attention of the Prophet (peace and blessings be upon him) by saying "Subhanallah," but he continued the prayer and did not return (to sit).

It is narrated from Sayyiduna Sa’d bin Abi Waqqas (may Allah be pleased with him) that he stood up (instead of sitting for Tashahhud) after two rak’ahs, so the followers tried to draw his attention by saying“Subhanallah.”But he completed the prayer, and then, at the end of the prayer, he performed two prostrations (of forgetfulness), and said:“What did you think, that I would sit down? Indeed, I did as I saw the Messenger of Allah (peace and blessings be upon him) do.”These are the words of the narration of Ibn Mani’. Imam Abu Bakr (may Allah have mercy on him) says:“I think that Abu Mu’awiyah made a mistake in this chain.”

Sayyiduna Abdullah bin Ja'far (may Allah be pleased with him) narrates from the Noble Prophet (peace and blessings of Allah be upon him) that he said: "Whoever forgets something in his prayer should perform two prostrations while sitting." Abu Musa has mentioned the name of Sayyiduna Abdullah bin Ja'far's student as 'Uqbah bin Muhammad bin Harith. Imam Abu Bakr (may Allah have mercy on him) says that there is a difference among the companions of Ibn Jurayj regarding the name of this shaykh ('Uqbah bin Muhammad). Hajjaj bin Muhammad and 'Abdur Razzaq have mentioned his name as 'Uqbah bin Muhammad. To my knowledge, this is correct. There is a difference among the companions of Ibn Jurayj regarding the name. Hajjaj bin Muhammad and 'Abdur Razzaq have mentioned his name as 'Uqbah bin Muhammad. To my knowledge, this is correct.