The book "Explaining the defects that the readers should avoid" by Ibn Al -Banaa al -Baghdadi has a great scientific and historical value, despite its small size, as it is the first book to be published from the books of our immortal heritage that addresses "speech defects", which he thought that Arabic did not know the authorship, It is also the first book to be printed from Ibn Al -Banaa, from which only a little thing remains.