Genesis 38:15-18

Judah noticed her and thought she was a prostitute, since she had covered her face. So he stopped and propositioned her. “Let me have sex with you,” he said, not realizing that she was his own daughter-in-law. “How much will you pay to have sex with me?” Tamar asked. “I’ll send you a young goat from my flock,” Judah promised. “But what will you give me to guarantee that you will send the goat?” she asked. “What kind of guarantee do you want?” he replied. She answered, “Leave me your identification seal and its cord and the walking stick you are carrying.” So Judah gave them to her. Then he had intercourse with her, and she became pregnant.