The aim of this paper is to investigate how two Pauline pericopes (Gal 3:21–26 and Rom3:21–24) can help us to understand Matt 8:5–13. The paper has four research questions: Whatdid the role of πίστις (“faith” or “trust”) played in Roman culture in general? What role did itplay in the centurions’ relationship to both superiors and subordinates in the Roman’s army?Which principle of faith does Paul establish in Gal 3:21–26 and Rom 3:21–24? How canPaul’s principle be used as a key to understand the faith of the centurion in Matt 5:8–13? Tofind the results of the four research questions, the paper used qualitative method throughsocial-rhetorical Criticism and narrative method. The results of this paper show that theGreco-Roman society was immersed in the ideology of patronage where there was always abeneficiary and a client. Πίστις means two sorts of relationship, one that was vertical and theother that was horizontal. Paul presents πίστις as the one who has divided the time in twoperiods. the old period that was under the power of sin and the new period that is under thepower of faith. The purpose of God was to save the whole creation through πίστις Χριστοῦ.Believers in πίστις Χριστοῦ are the coheirs of Abraham as “spiritual” descendants. Finally,Πίστις Χριστοῦ unites people of different social and ethnical status as one family. Thus,according to the Matthean point of view, the people who do not believe in πίστις Χριστοῦwill be judged by God.