Genesis 38:27-30

27The time came for Tamar to give birth, and she had twin boys.

28When she was giving birth, one of them put out his hand. The midwife took a piece of red yarn, tied it on his wrist, and said, “This one came out first.”

29As he pulled back his hand, his brother was born. So she said, “Is this how you burst into the world!” He was named Perez [Bursting Into].

30After that his brother was born with the red yarn on his hand. He was named Zerah [Sunrise].