Genesis 19:26
And Lot's wife looked behind her, and was turned in to a pillar of salt.
Genesis 19:17
When they had brought them out, they said, "Save thy life and look not behind thee, neither tarry thou in any place of the country, but save thyself in the mountain, lest thou perish."
Numbers 16:38
for the censers of these sinners are hallowed in their deaths: and let them be beaten into thin plates and fastened upon the altar. For they offered them before the LORD, and therefore they are holy and they shall be a sign unto the children of Israel."
Proverbs 14:14
An unfaithful person shall be filled with his own ways; but a good man will beware of such.
Luke 17:31-32
At that day, he that is on the housetop, and his stuff in the house: let him not come down to take it out. And likewise let not him that is in the fields, turn back again to that he left behind.
Hebrews 10:38
But the just shall live by faith. And if he withdraw himself, my soul shall have no pleasure in him.