Prayer sentences are uttered to praise people, to ask for happiness, serenity, health, longevity, and overcoming the enemies, whereas curse sentences are uttered to ask for harming the enemies and the ill-willed people, complaining as well as expressing surprise and humor. In the standard Persian these sentences include: a prayer/curse verb stem+the suffix -+ attached third person subject pronoun. However, Dezfuli and Shooshtari, as two dialects which are spoken in the Khouzestan provice, are different as they use object pronouns. The present paper aimed at analysing the hiatus and how it is resolved in these verbs. Hiatus is a situation in which there is no consonant between the nuclei of two adjacent syllables. It occurs when the left syllable lacks a coda and the right one lacks an onset. According to the findings of this research conducted within Optimality Theory (Prince and Smolensky, 1993/2004) hiatus in prayer and curse verbs is resolved using vowel deletion as well as intervocalic consonant insertion. In so doing, the constraints and their rankings that cause all these hiatus resolving strategies in these verbs are introduced. The results of the present paper explain some important facts regarding hiatus and its resolution strategies in the Standard Persian as well as Dezfuli and Shooshtari Dialects.