'Shekels' in the Bible

“My lord, listen to me; a piece of land worth four hundred shekels of silver, what is that between me and you? So bury your dead.”

Abraham listened to Ephron; and Abraham weighed out for Ephron the silver which he had named in the hearing of the sons of Heth, four hundred shekels of silver, commercial standard.

When the camels had finished drinking, the man took a gold ring weighing a half-shekel and two bracelets for her wrists weighing ten shekels in gold,

Then some Midianite traders passed by, so they pulled him up and lifted Joseph out of the pit, and sold him to the Ishmaelites for twenty shekels of silver. Thus they brought Joseph into Egypt.