Sahih Muslim Book 34, Hadith Number 6463.

Chapter : Knowledge would be taken away and ignorance would prevail upon people and the turmoil at the end of the world.

This hadith has been narrated on the authority of ‘Abdullah b. Umar through other chains of transmitters, but in the hadith transmitted by Umar b. ‘Ali there is an addition of these words: I met ‘Abdullah b. ‘Amr at the end of the year and I asked him about it, and he narrated to us the hadith as he had narrated before that he had heard Allah’s Messenger (may peace be upon him) as saying… (The rest of the hadith is the same).