Musnad Abu Ya'la al-Mawsili 42:151

Ishaq narrated to us, Sufyan narrated to us, from al-Zuhri, from Ubayd Allah ibn Abd Allah, from Abu Sa’id al-Khudri, that the Prophet (peace and blessings of Allah be upon him) forbade the turning of the mouths of water skins (to drink directly from them).