Here's some quotes from:
The Book of Knowledge
Abu Khaithama narrated to us, saying: Jareer reported to us from Abdullah bin Yazeed, i.e. As Sahbaanee, from Kumail bin Ziyaad that Abdullah (bin Mas'ood) said:
"Verily, you are in a time in which the scholars are many and the speakers are few. And verily there will come a time after you in which the speakers will be many and the scholars will be few."
Footnote: This narration in mawqoof form has an authentic chain. Its narrators are all narrators from the two Saheeh Collections, except for Abdullah bin Yazeed As Sahbaanee. However, he is trutsworthy and his biography can be found in al-Jarh wat-Ta'deel.
Abu Khaithama narrated to us, saying: Al-Hajjaj bin Muhammad reported to us from Ibn Juraij that he said: 'Ataa informed me that he heard Abu Hurairah say while people were asking him questions:
"If it were not for an ayah that was revealed in Surah Al-Baqarah, I would not have informed you about anything. If it were not that He said: 'Verily, those who conceal what We have sent down from the clear evidences and the guidance, after We have explained it clearly to the people in the Book, they are the ones cursed by Allaah and cursed by those who curse.'"
Footnote: I say (Shaykh Al Albani I think): Its chain of narration is authentic
according to the standards of Al-Bukhaaree and Muslim. Al-Bukhaaree 1/42 reported it from the path of Al-A'raj from Abu Hurairah.
The Ayah was 159.