Morag commenced studying at the Hebrew University in Jerusalem in 1943. In 1955 he received his PhD for his thesis on the Hebrew pronunciation of the Yemenite Jews, which he wrote under the supervision of his teachers, Shelomo Dov Goitein, Hans Jakob Polotsky and Naftali Herz Tur-Sinai. Other teachers who influenced him were Joseph Klausner, David Baneth and Hanoch Yelon.