Israeli archaeologists have discovered the earliest evidence of silver being used as currency in the Levant, dating back more than 3,600 years. The silver hoard was found in Israel’s Megiddo, Gezer, and Shiloh. (The Torah records Abraham weighing out 400 shekels to buy a burial plot.)

https://www.timesofisrael.com/study-claims-hoards-of-3600-year-old-cut-silver-pieces-are-first-currency-in-levant/