Genesis 19:26
"But his wife looked back from behind him, and she became a pillar of salt."
Cross References (ranked by relevance)
And it came to pass, when they had brought them forth abroad, that he said, Escape for thy life; look not behind thee, neither stay thou in all the plain; escape to the mountain, lest thou be consumed.
Now the just shall live by faith: but if any man draw back, my soul shall have no pleasure in him.
The backslider in heart shall be filled with his own ways: and a good man shall be satisfied from himself.
The censers of these sinners against their own souls, let them make them broad plates for a covering of the altar: for they offered them before the LORD, therefore they are hallowed: and they shall be a sign unto the children of Israel.