It is from the conditions of the Last Hour that knowledge would be taken away and ignorance would prevail (upon the world), the liquor would be drunk, and adultery would become rampant.

I was sitting with 'Abdullah and Abu Musa that they reported Allah's Messenger (ﷺ) having said: Prior to the Last Hour, there would be a time when knowledge would be taken away, and ignorance would take its place and there would be bloodshed on a large scale.

Verily, Allah does not take away knowledge by snatching it from the people but He takes away knowledge by taking away the scholars, so that when He leaves no learned person, people turn to the ignorant as their leaders; then they are asked to deliver religious verdicts and they deliver them without knowledge, they go astray, and lead others astray.