The 1979 Islamic Revolution was a tectonic change that influenced the geopolitics of the Middle East to this day. This article highlights the necessity of re-examining the events of 1979 from a securitisation perspective. Through an investigation of Ayatollah Khomeini's pivotal role, I challenge the methodological nationalism often found in the study of Israel–Iran relations. Despite his unconventional position in security matters, Khomeini played a crucial role in the securitisation of the 1979 revolution. Drawing on Israeli Ministry of Foreign Affairs archives, secondary sources, elite interviews, and Khomeini's theological speeches, this article re-examines the intricate stages of securitisation and counter-securitisation spanning 16 years. Khomeini effectively mobilized the political audience (Iranian people) to support the revolution, aiming to overthrow the Shah and remove Israel’s presence from Iran. I argue that a non-linear securitisation process was employed, characterised by Khomeini's ability to establish informal authority among the opposition. This process ultimately led to him gaining legitimacy from the Iranian people and culminated in the successful securitisation act of the 1979 Islamic Revolution.