Musnad Abu Ya'la al-Mawsili 110:53

Abu Bakr ibn Abi Shaybah narrated to us, Ubayd Allah ibn Musa narrated to us, from Ibrahim ibn Isma'il, from Salih ibn Kaysan, from Ubayd Allah ibn Abd Allah ibn Utbah, from Ibn Abbas, who said: The Messenger of Allah (may Allah bless him and grant him peace) forbade drinking from the mouth of a waterskin (or vessel) that has been turned inside out (or has a narrow opening).