Over them only was spread an heavy night, an image of that darkness which should afterward receive them: but yet were they unto themselves more grievous than the darkness.
WEB
while over them alone was spread a heavy night, an image of the darkness that should afterward receive them; but to themselves, they were heavier than darkness.
DRC17:20
But over them only was spread a heavy night, an image of that darkness which was to come upon them. But they were to themselves more grievous than the darkness.
LXXE
over them only was spread a heavy night, an image of that darkness which should afterward receive them: but yet were they unto themselves more grievous than the darkness.