After he completed his studies, he began travelling to peruse further knowledge and visited many cities such as Mecca, Medina, Damascus, Harran, Edessa, Alexandria and others, prior to beginning to teach in the Al-Zafiri Mosque in Cairo.
After that, he served as Shafi'i professor of hadith sciences at Dar al-Hadith al-Kamiliyya mosque for about 20 years.
He refused to make a religious determination for a bizarre reason, which reveals to us his justice, the softness of his soul, and his ability to identify virtue in those who possess it.
"[10][11] Izz al-Din ibn 'Abd al-Salam said: "Our Shaikh, Zakiuddin had no equal in the Science of Hadith with all of its various branches.
He was extremely well-versed in his knowledge of the Hadith reporters, their disparagement and their integrity (JarhwaTa'dil), their deaths, their births and their life events.