Genesis 38:28

26Judah acknowledged them, and said, “She is more righteous than I, because I didn’t give her to Shelah, my son.” He knew her again no more.

27In the time of her travail, behold, twins were in her womb.

28When she travailed, one put out a hand, and the midwife took and tied a scarlet thread on his hand, saying, “This came out first.”

29As he drew back his hand, behold, his brother came out, and she said, “Why have you made a breach for yourself?” Therefore his name was called Perez.

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