Musnad Ahmad 1061:11

Rawh narrated to us, Ibn Jurayj and Zakariya ibn Ishaq narrated to us, they said: Abu al-Zubayr narrated to us that he heard Jabir ibn Abdullah saying: Abu Humayd informed me that he brought to the Prophet, may Allah bless him and grant him peace, a vessel of milk from al-Naqi’, which was not covered. The Prophet, may Allah bless him and grant him peace, said: "If only you had covered it, even by placing a stick across it." Abu Humayd said: "The Prophet, may Allah bless him and grant him peace, only commanded that water skins be tied and that doors be closed at night." Zakariya did not mention Abu Humayd’s statement "at night."