﴿ وَثَمُودَا۟ فَمَآ أَبْقَىٰ ﴾

“and Thamud, leaving no trace [of them],”

and Thamūd wa-Thamūda may be declined as the name of their forefather or left as a diptote being the name of the tribe; it is a supplement to ‘Ādan sparing not a single one of them;