The modern concept of knowledge is an anomaly. The notion that knowledge is something that can be found on a sheet of paper, in a book, in a hard drive, in the digital cloud, this is not the kind of knowledge that the Islamic tradition is based on.

True knowledge cannot be abstracted away from living, breathing people. For example, Allah sent revelation by way of the angel Jibril to the Messenger صلى الله عليه وسلم. The Prophet صلى الله عليه وسلم passed on his knowledge through companionship — namely, by teaching his companions, who took instruction not only from his words but also his actions, his behavior, his blessed manners, etc. Human beings are thus the conduits of knowledge and the Islamic tradition has operationalized that through the concept of isnad, i.e., chain of transmission.

To claim to truly know something of `ilm, i.e., what Allah has revealed, one has to know all the persons through which that knowledge has passed over the centuries until it arrived at you by way of your teacher. Reading from a book or the internet is not a substitute for this. At most, one is merely familiarizing oneself with texts, which, don’t get me wrong, has its own benefits if done correctly. But to be an `alim, to speak authoritatively about a religious issue of contention often requires isnad. This is how Allah has preserved the deen.

And this is why the Prophet صلى الله عليه وسلم said,