Musnad Abu Ya'la al-Mawsili 23:1

Ahmad ibn Ibrahim narrated to us, Abu Abd al-Rahman narrated to us, Sa'id narrated to us, Abu al-Aswad narrated to me, from Bukayr ibn Abd Allah, from Busr ibn Sa'id, from Khalid ibn 'Adi al-Juhani, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Whoever receives a kindness from his brother without asking for it and without craving it, let him accept it and not reject it, for it is only a provision that Allah has driven to him."