Avraham accepted Efron’s terms. Avraham paid out to Efron the money that he had named in the hearing of the children of Ches—four hundred shekels of silver at the going merchants’ rate.
English: Rabbi Chanina said: Every unspecified “silver” mentioned in the Torah is a sela, except for the silver of Efron; even though it is written in the Torah without specification, they were nonetheless centenaria (heavy coins), as it is written “four hundred shekels of silver, current among the merchants.”
On the daf / in context: Bekhoros 50a (and parallel) establishes the default value of biblical “shekel / kesef” as a sela, with Efron’s payment as the explicit exception that required commercial-weight coins.
Type of Learning
Custom (Bavli — value of biblical shekel; exception of Efron)
What Is Learned
Unspecified monetary amounts in the Torah are calculated as ordinary selas; Efron’s four hundred shekels were the heavier commercial standard, as the verse itself marks them “current among the merchants.”