Genesis 38:27, 29-30

It came about at the time she was giving birth, that behold, there were twins in her womb.

But it came about as he drew back his hand, that behold, his brother came out. Then she said, “What a breach you have made for yourself!” So he was named Perez. Afterward his brother came out who had the scarlet thread on his hand; and he was named Zerah.