Genesis 38:28-30

28And when she was in labor, one put out a hand, and the midwife took and tied a scarlet thread on his hand, saying, "This one came out first."

29But as he drew back his hand, behold, his brother came out. And she said, "What a breach you have made for yourself!" Therefore his name was called Perez.

30Afterward his brother came out with the scarlet thread on his hand, and his name was called Zerah.