Where does thr saying as come from?

The saying "as" doesn't really exist as a complete phrase. "As" is a word with various meanings and functions in English, and it's used in countless expressions.

Could you clarify what you mean? Perhaps you're thinking of a specific saying or idiom that includes "as" or a phrase that you'd like to know the origin of?

For example, you could be asking about:

* "As a matter of fact..."

* "As we speak..."

* "As the crow flies..."

* "As easy as pie..."

Once you provide more context, I can help you trace the origin of the phrase you're interested in. 😊