The Power of Knowledge
After Mu’adh left for Syria, he (Umar RA) used to say:
His departure is a great loss to Madeenah and its people in the area of fiqh, because they have lost his ability to issue fatwas to the people of Madeenah.
Mu’adh encouraged the people to seek knowledge, and he said: “Seek knowledge, for learning for the sake of Allah is piety, seeking it is worship, discussing it is tasbeeh, pursuing it is jihad, and teaching it to one who does not know it is charity. Knowledge shows us what is halal and what is haraam , and is the beacon of the people of Paradise. It brings comfort when one is lonely and shows the correct way to behave at times of ease and times of hardship. It is a weapon against one’s enemies. Allah raises people (in status) because of it and makes them among the elite, leaders whose example is followed and whose opinion is adopted.”
Ibid, p. 285; Hilyah al-Awliya’, 1/239.