1400 years ago, the concept of bacteria as microscopic organisms was unknown, but the Quran described a scenario that aligns with our modern understanding. Back then, no one could have imagined that invisible organisms, too small to be seen by the naked eye, exist everywhere. Today, we know bacteria are microscopic and can spread through various surfaces, including our shoes.

Bacteria are microscopic organisms that can be found in a variety of environments, including in the soil, air, and on objects. A notable study conducted by the University of Arizona in 2016 showed that the soles of shoes carry over 400,000 bacteria, and a significant portion of those bacteria transfer to clean floors upon contact. Some shoes even contain harmful bacteria like Clostridium difficile (C. diff), which can cause severe illness. This understanding of bacteria spreading through shoes was only known in modern science, yet the Quran referred to a practice that aligns with this fact.

In Surah 20:12, when Allah speaks to Moses, He commands him to remove his shoes in the sacred valley:

The removal of shoes is an act of purification and reverence, ensuring that nothing impure desecrates the sacred ground. The Quran, revealing this act, highlights the importance of cleanliness and purity.

Today, we understand that shoes can carry bacteria and dirt that can spread contamination. Removing shoes before entering certain spaces is a hygienic practice, especially in environments where cleanliness is paramount, like homes or sacred places.

1400 years ago, there was no scientific knowledge of bacteria or microorganisms. Yet, the Quran contains guidance for Moses to remove his shoes, which corresponds with modern findings about how shoes carry invisible contaminants. This insight, given the era's limited understanding of hygiene and microbiology, suggests knowledge that goes beyond human capacity at the time.