Genesis 19:15-17, 22, 26

And when the morning arose, then the angels hastened Lot, saying, Arise, take thy wife, and thy two daughters that are here, lest thou be consumed in the iniquity of the city. But he lingered; and the men laid hold upon his hand, and upon the hand of his wife, and upon the hand of his two daughters, Jehovah being merciful unto him: and they brought him forth, and set him without the city. 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.

Haste thee, escape thither; for I cannot do anything till thou be come thither. Therefore the name of the city was called Zoar.

But his wife looked back from behind him, and she became a pillar of salt.