What events transpired after the Prophet's death regarding the succession of leadership among the Companions such as Umar, Abu Bakr, and Ali? And is it true that Ali was not pleased with Abu Bakr's caliphate, and what are the details of that?

The context does not allow for a detailed recounting of what transpired between the Companions regarding the selection of a Caliph after the Messenger of Allah, peace and blessings be upon him. The details of these events are documented in the books of Sunnah. It is not true what was mentioned, that Ali, may Allah be pleased with him, was not pleased with the caliphate of Abu Bakr, may Allah be pleased with him; rather, it is established that he pledged allegiance to him twice.

Among what should be noted:

Firstly: The matter of the Caliphate was of concern to the Companions after the death of the Messenger of Allah, peace and blessings be upon him, and that was based on ijtihad (independent reasoning) and seeking advice, and what was in the interest of the Ummah.

Secondly: Not everything in the history books regarding that issue is true; rather, some of it is authentic, and some of it is false or fabricated.

Thirdly: It is obligatory upon us to cleanse our hearts towards the Companions, may Allah be pleased with them, and to guard our tongues from slandering them, and to believe that they were mujtahideen (those who exerted independent reasoning).

Fourthly: What benefit does a Muslim gain by delving into what occurred between the Companions? Indeed, that may lead to tribulation for him.