Genesis 38:12-15

In the course of time the wife of Judah, Shua’s daughter, died. When Judah was comforted, he went up to Timnah to his sheepshearers, he and his friend Hirah the Adullamite. And when Tamar was told, “Your father-in-law is going up to Timnah to shear his sheep,” she 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. When Judah saw her, he thought she was a prostitute, for she had covered her face.