Genesis 38:12-17

12After a long time Judah’s wife, the daughter of Shua, died. When Judah had finished mourning, he and his friend Hirah the Adullamite went up to his sheepshearers at Timnah. 13When Tamar was told, “Your father-in-law is going up to Timnah to shear his sheep,” 14she removed her widow’s garments, covered her face with a veil to disguise herself, and sat at the entrance to Enaim, which is on the way to Timnah. For she saw that although Shelah had grown up, she had not been given to him as a wife.

15When Judah saw her, he thought she was a prostitute because she had covered her face. 16Not realizing that she was his daughter-in-law, he went over to her and said, “Come now, let me sleep with you.”

“What will you give me for sleeping with you?” she inquired.

17“I will send you a young goat from my flock,” Judah answered.

But she replied, “Only if you leave me something as a pledge until you send it.”