The first sanctuary ever built for mankind was that Bakkah [Makkah], a blessed place, a guidance to the peoples. In it there are plain signs; the place where Abraham stood. Whoever enters it is safe. And Pilgrimage to the House is a duty to Allah from mankind, for all who are able to make a journey. As for the disbelievers [they should know that] Allah is Independent of All creatures.
(Qur’an: Ali ‘Imran 3:96-97)