"And We have certainly left of it a sign"—meaning: [a lesson]—"as evidence for a people who use reason," and they are the believers. The explanation of the story of the people of Lot has already passed.
Surat al-Qasas from (verse 36 to verse 38).
﴿وَلَقَد تركنَا مِنْهَا آيَة (ل ٢٦٠﴾ بَيِّنَة﴾ أَي: [عِبْرَة] ﴿لقوم يعْقلُونَ﴾ وَهُمُ الْمُؤْمِنُونَ، وَقَدْ مَضَى تَفْسِيرُ قصَّة قوم لوط.
سُورَة الْقَصَص من (آيَة ٣٦ آيَة ٣٨).