Genesis 38:13-16

13And when Tamar was told, "Your father-in-law is going up to Timnah to shear his sheep,"

14she took off her widow's garments and covered herself with a veil, wrapping herself up, and sat at the entrance to Enaim, which is on the road to Timnah. For she saw that Shelah was grown up, and she had not been given to him in marriage.

15When Judah saw her, he thought she was a prostitute, for she had covered her face.

16He turned to her at the roadside and said, "Come, let me come in to you," for he did not know that she was his daughter-in-law. She said, "What will you give me, that you may come in to me?"