Narrated Abu Musa (radiyallaahu-anhu): Two men of my tribe and I entered upon the Prophet (sallal-laahu-alayhi-wasallam). One of the two men said to the Prophet (sallal-laahu-alayhi-wasallam): ‘O Messenger of Allah, appoint me as a governor,’ and so did the second one. The Prophet (sallal-laahu-alayhi-wasallam) said: [إِنَّا لَا نُوَلِّي هَذَا مَنْ سَأَلَهُ وَلَا مَنْ حَرَصَ عَلَيْهِ] We do not assign the authority of ruling to those who ask for it, nor to those who are keen to have it.’’

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[Bukhaari. Vol 9. Hadeeth Number: 7149]