Genesis 38:26-30

Judah recognized them as his and said, “She is more righteous than I, for I never gave my son Shelah to marry her.” And he let her go free and never slept with her again. When it was time for her to give birth, there were twins in her womb! While she was in labor, one hand popped out, so the midwife wrapped a crimson thread around its wrist, saying, “This one came out first.” But immediately, he drew his hand back, and out came his brother; and she said, “Look how you have broken out of the womb!” So, he was named Perez, the one who breaks through. Afterward, his brother came out, the one with the crimson thread on his wrist. That’s why they named him Zerah (“the crimson one”).