ثُمَّ لَنَحْنُ أَعْلَمُ بِٱلَّذِينَ هُمْ أَوْلَىٰ بِهَا صِلِيًّا
Then, indeed, We are most knowing of those who are more suited to it for exposure to its heat.
Roots in this verse: ع ل م (Elm), و ل ي (wly), ص ل ي (Sly)