'Abdullah reported: By Him besides Whom there is no god, there is no chapter in the Book of Allah about which I do not know as to where it was revealed and there is no verse about which I do not know in what context it was revealed, and if I were to know of one having a better understanding of the Book of Allah than I (and I could reach him) on the back of the mule, I would have definitely gone to him on camel's back.
Hadith Referenceصحيح مسلم / كتاب فضائل الصحابة / 2463
Hadith Gradingمحدثین:أحاديث صحيح مسلم كلها صحيحة
Hadith Takhrij«أحاديث صحيح مسلم كلها صحيحة»
Explanation & Benefits
Shaykh Maulana Abdul Aziz Alvi
Hadith Commentary: Benefits and Issues: From the conduct of Abdullah ibn Mas'ud (radi Allahu anhu), it becomes clear that a person may express his knowledge and virtue when there is a need or purpose for it. However, to do so without necessity, or for the sake of self-aggrandizement and pride, is not permissible.
Source: Tuhfat al-Muslim: Commentary on Sahih Muslim, Page: 6333