Genesis 38:13-16

13When Tamar was told, “Your father-in-law is on his way to Timnah to shear his sheep,”

14she took off her widow’s clothes, covered herself with a veil to disguise herself, and then sat down at the entrance to Enaim, which is on the road to Timnah. For she saw that, though Shelah had now grown up, she had not been given to him as his wife. 15When Judah saw her, he thought she was a prostitute, for she had covered her face.

16Not realizing that she was his daughter-in-law, he went over to her by the roadside and said, “Come now, let me sleep with you.” “And what will you give me to sleep with you?” she asked.