Tafsir of Ad-Dhariyat 51:37

And We have left there a sign for those who fear the painful torment. meaning, `We left a proof of the punishment, torment and stones made of Sijjil (baked clay) that We sent on them; We made their dwelling place a putrid, evil, dead sea. This should provide a lesson for the believers,'

للذين يخافون العذاب اﻻليم

(for those who fear the painful torment)