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After finishing primary education in Yemen, Wadi'i spent roughly two decades studying Islam in Saudi Arabia. In 1963 he began by studying at the Salafi teaching centre developed by Muhammad ibn al Uthaymeen in Najran before then being accepted to study at the Islamic University of Madinah where he attended Halaqas led by Hadith scholar Muhammad Nasiruddin al-Albani and Abdul-Ghaffar Hasan Al-Hindi as well as former Grand Mufti Abd-al-Aziz ibn Abd-Allah ibn Baz while also studying under Muhammad al-Sumali. Wadi'i is said to have graduated from the Islamic University of Madinah with a masters degree in the science of hadith.