Zallum was born in 1924 in the city ofHebron in Mandatory Palestine. By the age of 15, he acquired his elementary education from al-Ibrahemia school in city of al-Khaleel. He was appointed as a teacher in 1949 to the schools of Bethlehem for a period of two years. Zallum wrote a book titled How the Khilafah was Destroyed, which explains in great detail the events that forced the fall of the Ummah of Muhammad. He recounts several instances that contributed to the historical event and his book offers lessons to prevent the same pitfalls from reoccurring.