But if the LORD creates something new, so that the ground opens its mouth and swallows them and everything that belongs to them and they all descend directly to Sheol while still alive, then you'll know that these men have spurned the LORD."

So they and all that belonged to them descended alive to Sheol. Then the earth closed over them. That's how they were annihilated from the assembly.

from Zerah, the family of the descendants of Zerah; and from Shaul, the family of the descendants of Shaul.

The descendants of Judah, listed according to their families, included: From Shelah, the family of the descendants of Shelah; from Perez, the family of the descendants of Perez; and from Zerah, the family of the descendants of Zerah.