It was narrated from Jabir bin 'Abdullah that:
The Prophet said: "Do not seek knowledge in order to show off in front of the scholars, or to argue with the foolish, and do not choose the best seat in a gathering, due to it (i.e. the knowledge which you have learned) for whoever does that, the Fire, the Fire (awaits him)."
English reference: Vol. 1, Book 1, Hadith 254
Arabic reference: Book 1, Hadith 263