تغطية الآنية وإيكاء الأسقية
A preventive practice of covering food and drink containers at night, explicitly linked to avoiding contamination and disease-bearing agents.
غَطُّوا الْإِنَاءَ، وَأَوْكُوا السِّقَاءَ، فَإِنَّ فِي السَّنَةِ لَيْلَةً يَنْزِلُ فِيهَا وَبَاءٌ لَا يَمُرُّ بِإِنَاءٍ لَيْسَ عَلَيْهِ غِطَاءٌ ... إِلَّا وَقَعَ فِيهِ مِنْ ذَلِكَ الْوَبَاءِ
“Cover your vessels and tie your waterskins, for there is a night each year when an epidemic descends, and it settles into any uncovered vessel it passes.” (meaning, not a literal translation)
Commentators note this as an early articulation of basic food-safety and disease-prevention hygiene, regardless of how the specific 'night' is understood.