Best Manners are 10

From Al-Harmaas ibn Habeeb, who narrarated from his father, who narrarated from his grandfather, that he heard 'Aaishah (radhiyallahu 'anhaa) saying:

"The best manners are ten: 

1. Truthful speech
2. sincerity and courage in obedience to Allah
3. giving the one who asks
4. recompensing the worker [employee]
5. keeping the ties of kinship
6. giving back [being trustworthy] with that which you are entrusted upon
7. honesty and good treatment of the neighbor
8. honesty and good treatment of the spouse
9. honouring the guests
and the top of all, the [best manners] is
10. hayaa [shyness & modesty]."

[Taken from The Excellence of Aaishah The Mother of The Believers pg 47. Reference in Arabic (Makaarim-al-Akhlaaq of Ibn Abee Dunya(35).]