Numbers 19:22 And whatsoever the unclean person toucheth shall be unclean; and the soul that toucheth it shall be unclean until even.
All the way back in the days of Moses God instructed His people about contamination. If a person touched something unclean, infectious, they would be infected, contaminated, also. They were to separate themselves till the evening. The one who touched the infected item was not to touch others or be near them.
I love how God’s Word shows that He gave truth to His people long before the scientific world would understand it. If you have doubts about the Bible, this is one of those verses that should make you realize that it is a divine book. God gave truth that man couldn’t even understand.
There is without a doubt a spiritual application here, but the primary application was that God wanted to stop an infection from spreading among His people. The same can be said about sin but isn’t it thrilling to see how Moses knew such a truth when it would be hundreds of years before the medical community would understand these facts.