Injury to distinguish companions

The injury in distinguishing the Companions is a book written by Ibn Hajar Al -Asqalani, in which he sought to investigate all the companions and their translations, and it is considered one of the most important and broadest of the thousand books in the history of Islam at all, and its subject is the distinction between the Companions: Whoever accompanies his company and who is not valid, and who is true or not valid. And the total translation translation. It took forty years to write