﴿ وَتَرَكْنَا فِيهَآ ءَايَةًۭ لِّلَّذِينَ يَخَافُونَ ٱلْعَذَابَ ٱلْأَلِيمَ ﴾

“And so We left therein a message for those who fear the grievous suffering [which awaits all evildoers].”

And We left therein after destroying the disbelievers a sign an indication of their destruction for those who fear the painful chastisement so that they may not do what these sinners did.