Genesis 38:28-30

28And when she was in labor, one [baby] put out his hand, and the midwife took his hand and tied a scarlet thread on it, saying, “This one was born first.”

29But he pulled back his hand, and his brother was born first. And she said, “What a breach you have made for yourself [to be the firstborn]!” So he was named Perez (breach, break forth).

30Afterward his brother who had the scarlet [thread] on his hand was born and was named Zerah (brightness).