Genesis 38:13-16

13Tamar was told, “Listen, your father-in-law is going up to Timnah to shear his sheep.”

14So she removed her widow’s clothes and covered herself with a veil, and wrapped herself up [in disguise], and sat in the gateway of Enaim, which is on the road to Timnah; for she saw that Shelah had grown up, and she had not been given to him as a wife [as Judah had promised].

15When Judah saw her, he thought she was a [temple] prostitute, for she had covered her face [as such women did].

16He turned to her by the road, and said, “Please come, let me lie with you”; for he did not know that she was his daughter-in-law. And she said, “What will you give me, that you may lie with me?”