I heard the Messenger of Allah (ﷺ) saying: "Verily, Allah does not take away knowledge by snatching it from the people, but He takes it away by taking away (the lives of) the religious scholars till none of the scholars stays alive. Then the people will take ignorant ones as their leaders, who, when asked to deliver religious verdicts, will issue them without knowledge, the result being that they will go astray and will lead others astray."

[Al- Bukhari and Muslim].