Genesis 38:16-18

16He did not know that she was his son's widow. He went to her at the side of the road. He said, ‘Let me have sex with you.’ Tamar asked him, ‘If I have sex with you, what will you give me?’

17Judah replied, ‘I will take a young goat from my animals and I will give it to you.’ Tamar said, ‘Please give me something now to show me that you will really send the goat to me.’

18Judah asked her, ‘What should I give you?’ Tamar replied, ‘Give me your special ring and the string that holds it. And give me the stick that is in your hand.’ So Judah gave them to her. He had sex with her. As a result, she became pregnant.