sentences:  An initiative of the movement is an emphasis on the six "uṣūl" or "basic principles," two of which include "ilm", the pursuit of knowledge, and "dhikr" or "zikr", a method of prayer involving repetitive invocation of hadith and Qur'an passages.To this end, the movement places importance on "ijtema" or assembly, where members gather to practice and participate in "dhikr", hear religious sermons and discuss their activities.The largest of these, the Bishwa Ijtema, is situated by the Turag River in Tongi and attracts estimates of between two and four million Muslims annually as well as representatives from over sixty countries, making it the second biggest Islamic congregation after the Hajj.