Sahih Muslim Book 27, Hadith 28
Abd al-Rahman b. Samura, don't ask for authority for if it is granted to you for asking for it, you would be commissioned for it (without having the support of Allah), but if you are granted it without your asking for it. You would be helped (by Allah) in it. And when you take an oath and find something else better than that, expiate for (breaking) your oath, and do that which is better. This hadith has also been transmitted on the authority of Ibn Farrukh.
The above hadith is narratted through another chain of transmitters.
I heard 'Adi b. Hatim say that a person asked that and then narrated (the hadith) like one (mentioned above), but he made this addition:" Here are four hundred (dirhams) for you out of my gift."
This hadith has been narrated on the authority of 'Abd al-Rahman b. Samura through another chain of transmitters but there is no mention of the word" authority".