Genesis 35:21-23 Complete Jewish Bible (CJB)
21 Isra’el continued his travels and pitched his tent on the other side of Migdal-‘Eder. 22 It was while Isra’el was living in that land that Re’uven went and slept with Bilhah his father’s concubine, and Isra’el heard about it.
Ya‘akov had twelve sons. 23 The sons of Le’ah were Re’uven Ya‘akov’s firstborn, Shim‘on, Levi, Y’hudah, Yissakhar and Z’vulun.