In Islamic law, non-Muslims have the duty to provide for the upkeep of Muslims. British jihadist Anjem Choudary said in February 2013:

“We are on Jihad Seekers Allowance, We take the Jizya (protection money paid to Muslims by non-Muslims) which is ours anyway. The normal situation is to take money from the Kafir (non-Muslim), isn’t it? So this is normal situation. They give us the money. You work, give us the money. Allah Akbar, we take the money. Hopefully there is no one from the DSS (Department of Social Security) listening. Ah, but you see people will say you are not working. But the normal situation is for you to take money from the Kuffar (non-Muslim) So we take Jihad Seeker’s Allowance.”

This is, of course, based on the Qur’an: “Fight those who believe not in Allah nor the Last Day, nor hold that forbidden which hath been forbidden by Allah and His Messenger, nor acknowledge the religion of Truth, (even if they are) of the People of the Book, until they pay the Jizya with willing submission, and feel themselves subdued” (Qur’an 9:29).

“British benefits payments used to fund Paris and Brussels attack suspects’ campaign of terror, court hears,” by Martin Evans and Lexi Finnigan, Telegraph, November 24, 2016 (thanks to David):