Do not raise your voices above the voice of the Prophet...
Do not raise your voices above the voice of the Prophet, and do not speak loud to him as you speak loud to one another, lest your deeds become null while you do not perceive.” (Holy Qur'an 49:2) In this incident they went beyond raising their voices and talking loud to accusing the Messenger of Allah of talking nonsense, God forbid, then they increased their noise and differences until it became a battle of words in his presence.
I think the majority of the were with Umar, and that is why the Messenger of Allah found it useless to write the document, because he knew that they would not respect him and would not abide by the command of Allah by not raising their voices in his presence, and if they were rebellious against the command of Allah, then they would never obey the order of His Messenger.
Thus, the wisdom of the Messenger ruled that he was not to write the document because it had been attacked during his lifetime, let alone after his death. The critics would say that he was talking nonsense, and perhaps they would doubt some of the orders he passed whilst on his death-bed, for they were convinced that he was talking nonsense.
I ask Allah for forgiveness, and renounce what has been said in the presence of the holy Messenger, for how could I convince myself and my free conscience that Umar ibn al-Khattab was acting spontaneously, whereas his friends and others who were present at the incident cried until their tears wet the stones, and named the incident "the misfortune of the Muslims".
I therefore decided to reject all the justifications given to explain the incident, and even tried to deny it so that I could relax and forget about the tragedy, but all the books referred to it and accepted its authenticity but could not provide sound justification for it. I tend to agree with the Shi’i point of view in explaining the incident because I find it logical and very coherent.
I still remember the answer which al-Sayyid Muhammad Baqir al-Sadr gave me when I asked him, "How did our master Umar understand, among all the what the Messenger wanted to write, namely the appointment of ‘Ali as his successor, as you claim, which shows that he was a clever man?" Al-Sayyid al-Sadr said: Umar was not the only one who anticipated what the Messenger was going to write.