Mu-aadh Ibn Jabal (radiyallaahu-anhu) said:

Knowledge is obligatory upon you, for indeed seeking it is worship; learning it for the sake of Allaah is a good deed; giving it freeing to its people is a seeking to get close to Allaah; teaching it to the one who does not know about it is charity; researching it is Jihaad and revising it is glorification (of Allaah).

[Quoted by: Shaikh Jamaal al-Fareehaan al-Haarithee in Ad-Durar Al-Manthoor Minal Qawl Al-Ma’thoor: page: 67. The Shaikh referenced the original source of this statement of Mu-aadh (radiyallaahu-anhu) to Ad-Daylamee No: 2237; Tazkiratus Saami: 35 and Majmoo Al-Fataawaa: 4/42]