 Royal Physician to the Maharaja of Jammu and Kashmir for many years, his extensive travels included a long stay in the cities of Mecca and Medina in pursuit of religious learning.Noor-ud-Din was the first person to give bay'ah (pledge of allegiance) to Ghulam Ahmad in 1889 and remained his closest associate and confidant, leaving his home in Bhera and setting up permanent residence at Qadian in 1892.He assisted Ghulam Ahmad throughout the course of his religious vocation, himself authored several volumes of rebuttals in response to criticisms raised by Christian and Hindu polemicists against Islam and was instrumental in arranging some of the public debates between Ghulam Ahmad and his adversaries.