At Karingachira St. George Jacobite Syrian Cathedral, Baselios Thomas I ordained him as Rabban (monk) with the name Nahum on July 2, 2006, along with four others.
On July 3, 2006, Nahum Rabban along with four other monks, was raised to the highest order of bishophood-metropolitan-by Baselios Thomas I, at St. Thomas Jacobite Syrian Orthodox Church, North Paravoor, where Patriarch of Antioch, Moran Mor Ignatius Peter IV consecrated St. Gregorios Geevarghese, Chathuruthil along with others in 1876.