Regarding covering vessels
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، حَدَّثَنَا الأَعْمَشُ، عَنْ أَبِي صَالِحٍ، عَنْ جَابِرٍ، قَالَ كُنَّا مَعَ النَّبِيِّ صلى الله عليه وسلم فَاسْتَسْقَى فَقَالَ رَجُلٌ مِنَ الْقَوْمِ أَلاَ نَسْقِيكَ نَبِيذًا قَالَ " بَلَى " . قَالَ فَخَرَجَ الرَّجُلُ يَشْتَدُّ فَجَاءَ بِقَدَحٍ فِيهِ نَبِيذٌ فَقَالَ النَّبِيُّ صلى الله عليه وسلم " أَلاَّ خَمَّرْتَهُ وَلَوْ أَنْ تَعْرِضَ عَلَيْهِ عُودًا " . قَالَ أَبُو دَاوُدَ قَالَ الأَصْمَعِيُّ تَعْرُضُهُ عَلَيْهِ .
Jabir said: We were with Prophet (ﷺ) and he asked for something to drink. A man from the company asked: Should we not give you nabidh (drink made from dates) to drink ? He replied : Yes . The man went quickly and bought a cup of nabidh. The Messenger of Allah (ﷺ) said: Why did you not cover it up even by putting a piece of wood on it ? Abu Dawud said: Al-Asma'i's version has: "You put it on it..."