Musnad Ahmad 30:386

'Abd al-Wahid al-Haddad narrated to us, al-Rabi' ibn Muslim al-Qurashi narrated to us, from Muhammad ibn Ziyad, from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever does not thank the people, does not thank Allah, the Mighty and Majestic."