It is narrated that Imam Ali (AS) was asked:

Who is the best creature of God after infallible Imams (AS)? Imam (AS) replied: The righteous scholars. They asked: After Iblis, Faroe, Namrood, and those who unjustly sat in your place and used your titles, and are unjust rulers and took your rights away from you; who is the worst creature of God? Imam Ali (AS) replied: The unrighteous scholars; they display invalid cases and deny the truth. Then Imam Ali (AS) recited Ayah 159, Surah Al-Baqarah: “Those who conceal the clear (Signs) we have sent down, and the guidance after God have made it clear for the people in the book, on them shall be Allah’s curse, and the curse of all those who curse them (during all the times).”

[1] Beharul Anwaar, Vol. 2, Page 86

Source: en.shafaqna.com