The second line of evidence:
174 – The second point is this: if one were to set out for one of these places with a purpose that the Law actually permits—for example, travelling to Bayt al-Maqdis (Jerusalem) in the proper manner in order to pray there and observe iʿtikāf (spiritual retreat)—such a journey is, by the unanimous agreement of the Muslims, a righteous deed. Yet countless innovations have found their way into it, such as the innovations that