﴿ كَذَّبَتْ ثَمُودُ بِٱلنُّذُرِ ﴾

“[AND the tribe of] Thamud gave the lie to all [Our] warnings;”

Thamūd denied the warnings nudhur is the plural of nadhīr with the sense of mundhir that is to say they denied those matters which their prophet Sālih warned them of if they refused to believe in him and to follow him