If you’ve ever wondered why the symbol of health is a snake spiraling a staff (the Greek god Asclepius’s staff to be specific), it’s because in Ancient Greece they used small amounts of snake venom to treat serious illnesses We’ve come full circle
I always assumed what I felt was obvious: Numbers 21:4-9, where God instructs Moses to make a bronze serpent and place it on a pole to heal Israelites dying from poisonous snake bites.
If you want to read old texts a bit more grounded in reality try the Kama Sutra ... ;)