Musnad Ahmad 1125:1

Abu Abd al-Rahman al-Muqri narrated to us, Haywah narrated to us, Abu al-Aswad narrated to me, that Bukayr ibn Abd Allah ibn al-Ashajj informed him, that Busr ibn Sa'id informed him, from Khalid ibn Adi, from the Messenger of Allah (peace and blessings of Allah be upon him), that he said: "Whoever receives a kindness from his brother, without seeking it or asking for it, let him accept it and not reject it, for it is only a provision that Allah has driven to him."