The Town of Lut's People is overturned and Their Destruction

Allah, the Exalted, says,

فَلَمَّا جَآءَ أَمْرُنَا

At that time, the angels under Divine command said to Sayyidna Lut (علیہ السلام) : فَأَسْرِ‌ بِأَهْلِكَ بِقِطْعٍ مِّنَ اللَّيْلِ (So, move with your family in a part of night). And asked him to instruct everyone in his family not to turn and look back with the exception of his wife because she was going to be hit by the same punishment that was to fall on his people.

This could also mean that he was not to take his wife along with him. And it could also mean that, being his wife, she was to go along as part of his family, but she would not obey the instruction of not looking back he would give to his family. According to some reports, this is what happened. This wife started off with others, but when she heard the big bang of the punishment given to her people, she looked back and felt sorry at their destruction. At that moment there came a splintered rock and finished her off like others. (Qurtubi, Mazhari)