Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "I have been sent only so that I may perfect good character."
Imam Ahmad recorded this narration, and its narrators are the narrators of the Sahih.
Imam al-Bazzar recorded this narration, but he narrated these words: "So that I may perfect noble character." The narrators of this narration are likewise, except for Muhammad bin Rizqullah al-Kalwadhani, whose case is different, and he is thiqah (trustworthy).