Excerpts taken from the Biography of Maulana Muhammad Yusuf Sahid - Amire Tabligh by Maulana Mufti Azizur-Rahman Bijnori (Publisher: Madrasah Arabia Islamia, South Africa)
Hadrat Ji Maulana Muhammad Yusuf rahmatullah alayhi was of the opinion that for Deen and effort of Deen to spread throughout the world, it was necessary to start the work of dakwah in Arabia, because initially, Deen spread throughout the world from there. Consequently, Hadrat Ji rahmatullah alayhi formed jamaats amongst the hujjaj. They were given two instructions. Firstly, to perform hajj correctly and, secondly, to spread the effort in Arabia.
These jamaats proceeded to Arabia with the following message, "You brought Deen to us. At that time and even presently, you are more worthy of doing the effort of Deen. The people of the world learnt Deen from you. Hence, even now you should continue the same work."
Initially, the Indo-Pak Muslims were considered to be Jews because of their bearded faces. The government also placed certain restrictions upon them. However, when their reality became clear, the effort started flourishing.
Jamaats from Arabia reached Mesir (Egypt). The effort was introduced to the ulama' of Al-Azhar University. They in turn proceeded to the Indo-Pak subcontinent and other Arab countries. In brief, through different means the effort spread worldwide.