Prophet Hud - 11:52 O My people, ask forgiveness from your Lord, then turn to Him so that He may shower down upon you abundant mercy from the sky and add strength to your strength. Do not turn away as criminals!
Related:
The Heights/7:69 Are you surprised that a message from your Lord has come to a man from among you to warn you? Remember that He made you heirs after the people of Noah and made you stronger than them in creation. Think of the Blessings of Allah that you may succeed.

Explained in Detail/41:15 "As for Ad, they were arrogant in the earth unjustly and said: "Who is stronger than us?"Do they not realize that Allah, Who created them, is stronger than them? They were willfully disbelieving in Our signs and miracles."