Musnad Ahmad 30:1933

'Affan narrated to us, 'Abd al-Rahman ibn Ibrahim narrated to us, he said: al-'Ala' narrated to us, from his father, from Abu Hurayrah, from the Messenger of Allah (may Allah bless him and grant him peace): "Indeed, the religion began as something strange, and the religion will return as it began. So glad tidings to the strangers."