NET
10 The earth opened its mouth and swallowed them and Korah at the time that company died, when the fire consumed 250 men. So they became a warning.
Darby
10 And the earth opened its mouth, and swallowed them up together with Korah, when that band died, when the fire devoured the two hundred and fifty men; and they became a sign.
KJV
10 And the earth opened her mouth, and swallowed them up together with Korah, when that company died, what time the fire devoured two hundred and fifty men: and they became a sign.