Musannaf Ibn Abi Shayba 13:670

Abu Bakr narrated to us, he said: Ibn Abi Za’idah narrated to us, from Ibn ‘Awn, who said: It was said to Al-Qasim ibn Muhammad that Umar ibn Abd al-Aziz said that. Al-Qasim said: "This is my opinion, and I do not see his opinion regarding this except as being withdrawn."