Prominent Muslim scholar and known as Father of Global Jihad, Dr. Abdullah Azzam Stated:

“Constantinople was the headquarters of the synod of the Eastern Church. As Muhammad al Fatih was pounding the walls of Constantinople with the catapult, the men of the Church Synod were meeting and discussing how many devils are able to stand on the head of a pin.

We’re like that: the Jews, the enemies the Russians and the Americans are coming at us from every side, right? And some of us are still asking, ‘Is it an individual duty or a collective duty?’ May Allah pluck out your eye if you haven’t yet seen that Jihad is an individual duty!”