وَعَنْ رَجُلٍ مِنْ مُزَيْنَةَ قَالَ: قَالُوا: يَا رَسُولَ اللَّهِ مَا خَيْرُ مَا أُعْطِيَ الْإِنْسَانُ؟ قَالَ: «الْخُلُقُ الْحَسَنُ» رَوَاهُ الْبَيْهَقِيُّ فِي «شُعَبِ الْإِيمَان»
It is narrated from a man of the Muzainah tribe, who said: The Companions (may Allah be pleased with them) asked: O Messenger of Allah! What is the best thing that has been given to a person? He (peace and blessings of Allah be upon him) said: "Good character." Sahih, narrated by Al-Bayhaqi in Shu'ab al-Iman.