Pure as the driven snow

Pure as the driven snow is an idiom dates to the 1800s, but has much older roots. An idiom is a commonly used word, group of words, or phrase that has a figurative meaning that is not easily deduced from its literal definition. Often using descriptive imagery or metaphors, common idioms are words and phrases used […]
from Grammarist
https://grammarist.com/idiom/pure-as-the-driven-snow/