All praises are for Allah سبحانه و تعالى, who has made during every era of Messengers, people who would remain upon knowledge—who are known as Ahlul Ilm. They would guide or call the one that strayed from the right path to guidance. And they would remain patience upon the harm and difficulties in giving da’wah. And they would bring to life, using the book of Allah, those whose hearts were dead. And they would give sight with the light of Allah—those who were blinded and could’nt see the correct path.
So how many casualities that were taking by iblees, which they have revived to life with their knowledge. And how many were astray, arrogant whom they have directed to guidance.
So there is no better speech upon the people than the speech of Ahlul ilm. And there is no dirty or shameful act which is worse than the speech of the people against Ahlul Ilm
—From The Works Of Imaam Ahmad (Rahimahullah)