Genesis 23:15-16

15“My lord, listen to me: a piece of land worth four hundred ashekels
A  shekel was about 2/5 ounce or 11 grams
of silver, what is that between you and me? Bury your dead.”
16Abraham listened to Ephron, and Abraham cweighed out for Ephron the silver that he had named in the hearing of the Hittites, four hundred shekels of silver, according to the weights current among the merchants.

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