Genesis 38:8
Then Judah said to Onan, “Sleep with your brother’s wife. Perform your duty as her brother-in-law and raise up offspring for your brother.”
Berean Standard Bible
And Judah said unto Onan, Go in unto thy brother’s wife, and marry her, and raise up seed to thy brother.
Judah said to Onan, “Go in to your brother’s wife, and perform the duty of a husband’s brother to her, and raise up offspring for your brother.”