According to the Book of Genesis, Pharez/Pיrez (Hebrew: פֶּרֶץ / פָּרֶץ, ModernPéreẓ / PáreẓTiberianPéreṣ / Pāreṣ ; "Breach") was the son of Tamar and of Judah, and was the twin of Zerah[1]. The text argues that he was called Perez because he was the first twin to be born, and thus had breached the womb[2]. According to biblical scholars, the birth narrative here is an eponymousaetiological myth concerning the ethnological origin of parts of the tribe of Judah[3][4].