91:11

Thamud (people) denied (their Prophet) by reason of their transgression,
Meaning:-
Transgression: offense, crime, sin, wrong, wrongdoing.

91:13

But the Messenger of Allah [Salih (Saleh) ] said to them: “Be cautious! Fear the evil end. That is the she-camel of Allah! (Do not harm it) and bar it not from having its drink!”