The following hadith comes directly from Aisha herself when she refutes those who say that the Messenger of Allah hit her (in the above mentioned hadith):


`A'ishah said,"The Messenger of Allah never struck a servant of his with his hand, nor did he ever hit a woman. He never hit anything with his hand, except for when he was fighting Jihad in the cause of Allah. And he was never given the option between two things except that the most beloved of the two to him was the easiest of them, as long as it did not involve sin. If it did involve sin, then he stayed farther away from sin than any of the people. He would not avenge himself concerning anything that was done to him, except if the limits of Allah were transgressed. Then, in that case he would avenge for the sake of Allah.'' Imam Ahmad also recorded from Abu Hurayrah that the Messenger of Allah said,

«إِنَّمَا بُعِثْتُ لِأُتَمِّمَ صَالِحَ الْأَخْلَاق»

(I have only been sent to perfect righteous behavior.)


Tafsir ibn Kathir - Surah Qalam (68)
http://tafsir.com/default.asp?sid=68&tid=54734