Genesis 38:13

9 But Onan knew that the offspring would not belong to him; so whenever he would sleep with his brother’s wife, he would spill his seed on the ground so that he would not produce offspring for his brother.

10 What he did was wicked in the sight of the LORD, so He put Onan to death as well.

11 Then Judah said to his daughter-in-law Tamar, “Live as a widow in your father’s house until my son Shelah grows up.” For he thought, “He may die too, like his brothers.” So Tamar went to live in her father’s house.

12 After 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.

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

14 she 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.

15 When Judah saw her, he thought she was a prostitute because she had covered her face.

16 Not 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.”

Read all of Genesis 38