Many researchers, philosophers and linguistes have studied presupposition and its triggers, however the researcher knows that the inquiry of factive verbs as "presupposition triggers" in religious 'texts' and especially an analysis to Al-Imam Al-Sajad's Plea have not been explored yet. This paper aims at exposing how religious texts use factive verbs. Presupposition is a type of category used in data analysis that is necessary for the development of discourse since it appears to be in control of the dynamics of the conversation by distributing social roles during a speaking event, between the speaker and the addressee. The researcher tries to show how presuppositions act as deductions drawn from the use of specific lexical or grammatical categories are not consistently assigned to them and these categories are not related to one another in any systematic way. Thus the present study will show how lexical presupposition triggers, especially factive verbs are used in Islamic religious texts. It aims to attain the following points i- What verbs are utilized to express factive presupposition in religious texts? ii- Why are these verbs used in religious texts? Many factive verbs are thought to operate as presupposition triggers in Al-Imam Al-Sajad's Plea (Al-Saheefa Al-Sajadiya). Exploring the notion of presupposition, examining semantic and pragmatic presupposition, and finding presupposition triggers are the stages to be taken in this study in Al-Imam Al-Sajad' Plea according to a model proposed by Karttunen (n.d.), cited in (Levinson 1983:181-4,Yule 1996: 28).