A major element in the religious practice of believers in prophetic Christianity is the sharing of religious testimonies. Focusing on prophetic ministries in Botswana, this paper examines the nature and function of religious testimonies and the dynamics of their digitisation and online circulation. It explores the ways in which religious testimonies mediate or extend the reach of prophetic ministries. Using data collected through fieldwork observation, in-depth interviews and digital ethnography, I argue that the sharing of testimony within Pentecostal Christian circles can be described as a system of institutional performance that aims to direct the spiritual development of believers, reinforce the central place and authority of a prophet and advance the institutional identity of a prophetic ministry.