Gen 20:16

20:16 given your brother. Social convention demanded that the gift to Sarah be given through the male head of the family.

a thousand pieces of silver. A very large amount.

before everyone you are vindicated. Abimelech was guiltless and under no obligation to Abraham and Sarah (v. 6). Out of regard for the God of Abraham, however, Abimelech seeks to restore the honor that Sarah may have lost in the eyes of others.