This article makes a literary review to the linguistic research in the use of metaphor in didactic discourse; especially the religious one. Acknowledging Conceptual Metaphor Theory as the primary theory in the field, the researcher embarks upon how metaphor is perceived and analysed in discourse in order to pertain its persuasive function. The article presents different approaches to metaphor analysis and their interconnection. The implications of these approaches are later deduced and interpreted within the scope of Islamic religious discourse as an example of didactic discourses.