The science of Asma al-rijal is introduced in order to

The science of Asma al-rijal, also known as the science of Hadith Criticism, is introduced to authenticate the chains of narrators of Hadith. It is a method used by scholars to verify the reliability and credibility of the narrators who passed on the Hadith, which are the sayings, actions and approvals of the Prophet Muhammad (peace be upon him). The goal of Asma al-rijal is to ensure that the Hadith being studied and followed are authentic and accurately reflect the teachings of the Prophet, as opposed to being fabricated or altered in any way. This is important in preserving the integrity of the Hadith and the Sunnah, which is the example set by the Prophet and serves as a source of guidance for Muslims.