Since the declaration of the Caliphate in 2014, the Islamic State became a prominent protagonism of contemporary political debate, especially for its unprecedented media flow. Moving from an already vast literature on the topic, the chapter will analyze the video-testaments produced by IS as an internal propaganda format, able to build a sense of community between the fighters and to inspire new generations to join the jihadi effort. After connecting this visual practice with its immediate predecessor (al-Qaeda martyrs’ video-testaments), the chapter will provide an in-depth analysis of these videos, stressing the role of memory and inspiration, as well as their ability to produce a certain narrative of what it means to be a true Muslim.