Is it true that 80 percent of the Companions were killed in the path of Allah, and if so, how did 120,000 of them remain after the death of the Messenger? Or was this percentage killed in a specific battle, for example?

Major General Mahmoud Sheet Khattab mentioned in his book "Leaders of the Prophet, peace be upon him" that the percentage of martyrs among the Companions reached 80%, meaning that four out of every five were martyred in the battlefields of Jihad. This percentage was not stated by anyone before him, and there is nothing in historical and biographical books that confirms or denies it. This includes the martyrs among the Companions absolutely (during the lifetime of the Prophet, peace be upon him, and after his death). As for the number of Companions remaining after the death of the Prophet, peace be upon him, there is no definitive number, and the figures mentioned by scholars vary.