You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Islamism

Context:
Roughly contemporaneous with Maududi was the founding of the Muslim Brotherhood in Ismailiyah, Egypt in 1928 by Hassan al Banna. His was arguably the first, largest and most influential modern Islamic political/religious organization. Under the motto "the Qur'an is our constitution," it sought Islamic revival through preaching and also by providing basic community services including schools, mosques, and workshops. Like Maududi, Al Banna believed in the necessity of government rule based on Shariah law implemented gradually and by persuasion, and of eliminating all imperialist influence in the Muslim world.

Question:
The motto of the Muslim Brotherhood specifies what as being their constitution?

the Qur'an