这是关于那些法则的学问，借此可以了解圣训的传述链（sanad）和正文（matn）的状况。其目的在于区分sahīh圣训与其他圣训。它分为两种：关于传述的圣训学（riwāya）和关于意义的圣训学（dirāya）。关于传述的部分，包括传述先知ﷺ的言论、行为、默许和品性，涉及其叙述、准确性以及字句的记录（tahrīr alfādh）。关于意义的部分，通过它可以了解传述的实质、条件、类型和规则，以及传述者的状况、他们的条件、传述的类型及与之相关的内容。Dirāya还包括对圣训所含意义的认识，即它是否与明确的经文相抵触。

It is the science of those laws whereby the condition of the sanad [chain of transmission] and matn [text of the ḥadīth] is known. Its objective is to differentiate the sahīh hadīth from the others. It is of two types: the science of hadīth pertaining to transmission [riwāya] and the science of the hadīth pertaining to meaning [dirāya]. As for the one pertaining to transmission, it includes the transmission of the sayings of the Prophet , his actions, consent and attributes, with repsect to their narration, accuracy and transcription of words [tahrīr alfādh]. As for the one pertaining to the meaning, the reality, conditions, types and rules of transmission are known through it, as well as the state of the transmitters, their conditions, the types of the transmissions and that which is related to it. Dirāya also covers knowledge of the meaning contained in the hadīth in terms of whether it contradicts a definitive text.