Targum zu Bereschit 20:16

And to Sarah he said, Behold, I have given a thousand sileen of silver to thy brother; behold, they are to thee a veil of the eyes, inasmuch as thou wast hidden from thine husband one night, and I would have seen thee: for were I to give all that I have it would not suffice (or be proportionate). And the words were debated. And Abraham knew that Abimelek had not come near Sarah his wife.

And to Sarah he said, Behold, I have given a thousand sileen of silver to thy brother; behold, that silver is given to thee as a present, because thou wast hidden from the eyes of Abraham thy husband one night: and of all that I have, for on behalf of all I am corrected, behold, were I to give all whatever I have, it would not suffice. Let the words be approved, and may Abraham the Just learn that I have not known thee.