Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah(PBUH) said, "He who does not acquire knowledge with the sole intention of seeking the Pleasure of Allah but for worldly gain, will not smell the fragrance of Jannah on the Day of Resurrection.''
[Abu Dawud].

Commentary: This Hadith has an inducement for acquiring knowledge for the Pleasure of Allah alone. If a religious scholar acquires it to make it a means of worldly gains, then it turns to such a serious crime that such a scholar will not even smell the fragrance of Jannah (i.e., he will not enter it along with the saved). May Allah save us from it. However, if a scholar gains wealth and worldly gains through it without any intention, then it is altogether a different matter. In that case, it is not harmful for him as long as he uses it in a manner pleasing to Allah.