Do not break the promise
Righteousness is not that you turn your faces toward the east or the west, but [true] righteousness is [in] one who believes in Allah, the Last Day, the angels, the Book, and the prophets and gives wealth, in spite of love for it, to relatives, orphans, the needy, the traveler, those who ask [for help], and for freeing slaves; [and who] establishes prayer and gives zakah; [those who] fulfill their promise when they promise; and [those who] are patient in poverty and hardship and during battle. Those are the ones who have been true, and it is those who are the righteous.
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Do not be rude in speech
So by mercy from Allah, [O Muhammad], you were lenient with them. And if you had been rude [in speech] and harsh in heart, they would have disbanded from about you. So pardon them and ask forgiveness for them and consult them in the matter. And when you have decided, then rely upon Allah. Indeed, Allah loves those who rely [upon Him].
Be good to others
Worship Allah and associate nothing with Him, and to parents do good, and to relatives, orphans, the needy, the near neighbor, the neighbor farther away, the companion at your side, the traveler, and those whom your right hands possess. Indeed, Allah does not like those who are self-deluding and boastful,
Keep the etiquettes of war
And kill them [in battle] wherever you overtake them and expel them from wherever they have expelled you, and fitnah is worse than killing. And do not fight them at al-Masjid al-Haram until they fight you there. But if they fight you, then kill them. Such is the recompense of the disbelievers. (2: 191)
Do not be arrogant
[Allah] said, "Descend from it [i.e., Paradise], for it is not for you to be arrogant therein. So get out; indeed, you are of the debased."
Order righteousness to people only after practicing it yourself
Do you order righteousness of the people and forget yourselves while you recite the Scripture? Then will you not reason? (2: 44)