Musnad Ahmad 33:467

'Abd al-Samad narrated to us, Muhammad ibn Thabit narrated to us, Muhammad ibn al-Munkadir narrated to us, from Jabir, who said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "An accepted Hajj has no reward except Paradise." They said: "O Prophet of Allah, what is the righteousness (birr) of Hajj?" He said: "Feeding food and spreading peace."