Genesis 38:27-30

27When the time came for Tamar to give birth, it was discovered that she was carrying twins.

28While she was in labor, one of the babies reached out his hand. The midwife grabbed it and tied a scarlet string around the child’s wrist, announcing, “This one came out first.”

29But then he pulled back his hand, and out came his brother! “What!” the midwife exclaimed. “How did you break out first?” So he was named Perez.

30Then the baby with the scarlet string on his wrist was born, and he was named Zerah.