Zayd bin Aslam زيد بن أسلم · Chapters on Knowledge

that the Messenger of Allah (ﷺ) said: "Indeed Allah does not take away knowledge by removing it from the people, but He takes away knowledge by taking the scholars, until there remains no scholar and the people begin to ask the ignorant leaders, so they give their verdict without knowledge. They will go astray and lead the people astray."

from Abu Ad-Darda who said: "We were with the Prophet (ﷺ) when he raised his sight to the sky, then he said: 'This is the time when knowledge is to be taken from the people, until what remains of it shall not amount to anything." So Ziyad bin Labid Al-Ansari said: 'How will it be taken from us while we recite the Qur'an. By Allah we recite it, and our women and children recite it?' He (ﷺ) said: 'May you…

from his father that he heard the Messenger of Allah (ﷺ) saying: "Whoever seeks knowledge to contend with the scholars, or to use it to argue with the fools, and to have people's faces turn towards him, then he shall be admitted to the Fire."

from Yazid bin Salamah Al-Ju'fi, he said: "Yazid bin Salamah 'O Messenger of Allah! I heard so many narrations from you that I am afraid the last of them will cause me to forget the first of them. So narrate a statement to me that will encompass them.' So he said: 'Have Taqwa of Allah with what you learn.'"