Sahih Muslim Book 53, Hadith 58
May I not inform you about the inmates of Paradise? (And then informing about them) said: Every meek person who is considered to be humble and if they were to adjure in the name of Allah, Allah would certainly fulfil it. May I not inform you about the inmates of Hell-Fire? They are all proud, mean and haughty.
This hadith has been narrated on the authority of Shu'ba with the same chain of transmitters but with a slight variation of wording.
Many a people with dishevelled hair are driven away from the door (but they are so pious) that if they are to swear in the name of Allah, He would definitely fulfil that.