The authors present a detailed philological and linguistic comparison of two versions of The Prayer of Manasseh. Combing state-of-the-art computational tools together with traditional philology, the texts are compared at all linguistic levels, from their vocabulary up to their discursive structure, with a special emphasis on their morphology and syntax. The results are revealing not only for the question of the relationship between the two versions, but they also illuminate various debates pertaining to Syriac syntax.