Genesis 38:27-30

When the time came for Tamar to give birth, it was discovered that she was carrying twins. While 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.” But 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. Then the baby with the scarlet string on his wrist was born, and he was named Zerah.