Genesis 38:15

And it was told Tamar, saying, Behold thy father in law goeth up to Timnath to shear his sheep.

And she put her widow's garments off from her, and covered her with a vail, and wrapped herself, and sat in an open place, which [is] by the way to Timnath; for she saw that Shelah was grown, and she was not given unto him to wife.

And he turned unto her by the way, and said, Go to, I pray thee, let me come in unto thee; (for he knew not that she [was] his daughter in law.) And she said, What wilt thou give me, that thou mayest come in unto me?

And he said, I will send [thee] a kid from the flock. And she said, Wilt thou give [me] a pledge, till thou send [it]?