This is a way of telling them to run so that they do not die. Alternate translation: "Run away and save your lives!" (See: [[rc://en/ta/man/translate/figs-idiom]])
The phrase "at the city" is understood. Alternate translation: "Do not look back at the city" or "Do not look back at Sodom" (See: [[rc://en/ta/man/translate/figs-ellipsis]])
It is understood that they would swept away with the people of the city. This can be stated in active form. Alternate translation: "or else God will destroy you along with the people of the city" (See: [[rc://en/ta/man/translate/figs-ellipsis]] and [[rc://en/ta/man/translate/figs-activepassive]])