Chapter 43: General Behavior (Kitab Al-Adab)
Narrated Abud Darda': The Prophet (ﷺ) said: There is nothing heavier than good character put in the scale of a believer on the Day of Resurrection. Abu al-Walid said: I heard 'Ata al-Kaikharani say: Abu Dawud said: His name is 'Ata b. Ya' qub. He is the maternal uncle of Ibrahim b. Nafi'. He is called Kaikharani or Kukharani.
Sunan Abi Dawud 4799