Musnad Abu Ya'la al-Mawsili 115:272

Zuhayr narrated to us, Yunus ibn Muhammad narrated to us, Shayban narrated to us, from Qatadah, from Anas, that the people of Makkah asked the Messenger of Allah, may Allah bless him and grant him peace, to show them a sign, so he showed them the splitting of the moon twice.