What Does Genesis 46:12 Mean?

The sons of Judah: Er, Onan, Shelah, Perez, and Zerah (but Er and Onan died in the land of Canaan); and the sons of Perez were Hezron and Hamul. Judah's genealogical entry is the longest and most complex of the listing: five sons (the most of any patriarch-son) with two deaths noted and two grandsons included from Perez's line. Er and Onan are the sons who died in Canaan (Genesis 38:7,10: God killed them for their wickedness). Shelah is the son withheld from Tamar (Genesis 38:14). Perez and Zerah are the sons born of Tamar after Judah unknowingly slept with her (Genesis 38:29 to 30).

The deaths of Er and Onan in Canaan reduce Judah's effective migration count by two, but the list includes them in the genealogy because they are part of the official family record. The parenthetical notation "(but Er and Onan died in the land of Canaan)" is the accounting adjustment: they are counted in the family structure but not in the migration census. The two grandsons through Perez (Hezron and Hamul) compensate numerically, adding two to Judah's line in the migration count.

Perez and Zerah, the twins born of Tamar, are listed without reference to their unconventional origin (the Genesis 38 account of Judah and Tamar). The genealogy simply records their names as Judah's sons. Perez specifically becomes one of the most significant lineages in all of biblical genealogy: the Perez line leads to David and ultimately to the messianic dynasty. The son born through the complicated circumstances of Genesis 38: Perez, who broke through first: is the ancestor of Israel's greatest king. Hezron, son of Perez, appears in the eventual genealogy of David in Ruth 4:18.