Ezekiel 20:48

Not be quenched. The fire would be so fierce that no one would be able to extinguish it. Hence it would burn till it had accomplished its work of destruction. Then it would die of its own accord. This same expression, applied to the fires of hell (Mark 9:43, 45), is taken by some to mean that the fires of hell will continue throughout all eternity. Another text shows that such an interpretation is erroneous, for the fire in Jerusalem lighted by the Chaldeans was not quenched (Jer. 17:27), though it died out when the work of devastation was accomplished.