Al tabakat is considered as one of the most important book among the biography of prophet Bin saad take the first and second part to discuss the biography of prophet the fourth and fifth part Discussed the companions of prophet biography Ibn saad is one of the great schoolrs at prophet biography who took his science from Wakidi ,Abdullah bin Namir,Fadhl bin Dokin and Affan bin Muslim Affan bin muslim is less important than to spot light on his role as most significant shaikh of Ibn saad through his book ALtabkat make clear that this book contained many narrations that come from many accepted ways in contrastto anather shaikhs narrations like Hisham ALkalbi and Muhammad bin Omar ALwakidi in spite of AL_wakidi narrations that come to us by Ibn Saad whion is the best ones .