The Scholar, The Soldier, The Rich

Since there are two ingredients essential to all good things: that they should be intended for God's sake, and that they should conform to the Sacred Law, this must apply equally in speech and action, to good words and good works, to matters of knowledge and to matters of worship.

It is confirmed in an authentic narration that the Prophet, on him be peace, said:
"The first of three to fuel the fire of Hell is a man who studies and teaches and reads the Quran and has it read, but all so that people will say: 'He is a scholar and a Quran reader.' Then a man who fights and struggles so that people will say: 'He is courageous and brave.' Then a man who gives alms and gifts so that people will say: 'He is generous and openhanded.'"

Compiled From:
"Public Duties in Islam" - Ibn Taymiya, p. 117