The Book of al-Bay'ah

It was narrated from Tariq bin Shihab that: a man asked the Prophet, when he had put his leg in the stirrup: "Which kind of Jihad is best?'" He said: " a word of truth spoken before an unjust rulers."

It was narrated that 'Ubadah bin As-Samit said: "We were with the Prophet in a gathering and he said: 'Pledge to me that you will not associate anything with Allah, you will not steal, and you will not have unlawful sexual relations.' He recited the Verse to them (and said) Whoever does any of these things, and Allah conceals him then it is up to Allah, the mighty and Sublime: If He wills, He will punish him, and if He wills, He will forgive him.

it was narrated from Abu Hurairah that the Prophet said: "You will become keen for positions of authority, but that will become a regret and loss. What a good life they will live, but how hard it will be for them when they die."