NASB
"But what he did was displeasing in the sight of the LORD; so He took his life also."
— Genesis 38:10, NASB
But Er, Judah's firstborn, was evil in the sight of the LORD, so the LORD took his life.
Then Judah said to Onan, "Go in to your brother's wife, and perform your duty as a brother-in-law to her, and raise up offspring for your brother."
Onan knew that the offspring would not be his; so when he went in to his brother's wife, he wasted his seed on the ground in order not to give offspring to his brother.
But what he did was displeasing in the sight of the LORD; so He took his life also.
Then Judah said to his daughter-in-law Tamar, "Remain a widow in your father's house until my son Shelah grows up"; for he thought, "I am afraid that he too may die like his brothers." So Tamar went and lived in her father's house.
Now after a considerable time Shua's daughter, the wife of Judah, died; and when the time of mourning was ended, Judah went up to his sheepshearers at Timnah, he and his friend Hirah the Adullamite.
It was told to Tamar, "Behold, your father-in-law is going up to Timnah to shear his sheep."