Sayyiduna Nawwas bin Sam'an Ansari (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Allah Almighty has given an example: there is a straight path, on both sides of this path are two walls, in which there are open doors, and curtains are hanging over the doors. At the entrance of the path, a caller is saying: O people! Enter all of you into the path and do not deviate from it. And when someone wants to open any of the doors, a caller from the middle of the path calls out: You will be ruined, do not open it; if you open it, you will enter into it. (The explanation of this example is that) the path is Islam, and the walls are the boundaries set by Allah Almighty, and the open doors are the things forbidden by Allah Almighty, and the caller at the entrance of the path is the Book of Allah Almighty, and the caller in the middle of the path is the admonisher from Allah Almighty present in the heart of every Muslim."