Musnad Ahmad 30:1424

'Affan narrated to us, 'Abd al-Wahid ibn Ziyad narrated to us, Sa'id ibn Kathir ibn 'Ubayd narrated to us, he said: My father narrated to me that he heard Abu Hurayrah saying: The Messenger of Allah (may Allah bless him and grant him peace) said: "I have been commanded to fight the people until they bear witness that there is no god but Allah and that Muhammad is the Messenger of Allah, and they establish the prayer and give the zakat. Then, their blood and their wealth have become forbidden to me, and their reckoning is with Allah, the Almighty and Majestic."