Why did you not cover it even with a wood across it?
Sahih Muslim Book 36, Hadith 119
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We were with Allah's Messenger (ﷺ) and he asked for water. A person said: Allah's Messenger, may we not give you Nabidh to drink? He (the Holy Prophet) said: Yes (you may). He (the narrator) said: Then that person went out speedily and brought a cup containing Nabidh, whereupon Allah's Messenger (ﷺ) said: Why did you not cover it? - even if it is with a wood. He said that then he drank it.
Sahih Muslim Book 36, Hadith 118 Next Hadith → Cover vessels, waterskins, close the doors and extinguish the lamps, for the Satan does not loosen the waterskin, does not open the door and does not uncover the vessels. And if one amongst you fails to find (something) to cover it well, he should cover it by placing (a piece of) wood across it. Qutaiba did not mention the closing of the doors in the hadith transmitted by him.
Sahih Muslim Book 36, Hadith 120
Sahih Muslim Book 36, Hadith 118 Next Hadith → Cover vessels, waterskins, close the doors and extinguish the lamps, for the Satan does not loosen the waterskin, does not open the door and does not uncover the vessels. And if one amongst you fails to find (something) to cover it well, he should cover it by placing (a piece of) wood across it. Qutaiba did not mention the closing of the doors in the hadith transmitted by him.
Sahih Muslim Book 36, Hadith 120