Is it true that one of the Companions, Umar or Abu Bakr (may Allah be pleased with them both), said about the Prophet (peace and blessings be upon him) as he was dying, "Leave him, he is raving" or "Leave him, he is deluded," and is this present in the authentic books of Sunnah, and is it mentioned in Sahih al-Bukhari that the Messenger attempted suicide, and what is the text of that hadith with explanation?

Abu Bakr was not mentioned in the aforementioned hadith. What is authentically reported from Umar is his statement: "The Prophet, peace and blessings be upon him, was overcome by pain, and we have the Book of Allah, which is sufficient for us." The correct wording of the hadith is: "The pain of the Messenger of Allah, peace and blessings be upon him, intensified, so he said: 'Bring me, I will write for you a document after which you will never go astray.' So they disputed, and it is not proper to dispute in the presence of a prophet. And they said: 'What is wrong with him? Is he delirious? Ask him to clarify.' He said: 'Leave me, for what I am in is better...'" And whoever attributed the statement "Is he delirious?" to Umar has erred. Some scholars have explicitly stated that the one who said it said it in response to Umar and those with him, or that it was an error on the part of the speaker due to bewilderment and astonishment. Scholars have agreed that Umar, may Allah be pleased with him, saying "The Book of Allah is sufficient for us" was among the proofs of his jurisprudence and virtues, and that he feared that the Prophet, peace and blessings be upon him, might write things that the Companions would be unable to bear, and that Allah had perfected His religion and safeguarded the Ummah from error.