Surah Al-Anfal (The Spoils of War), Verse 13

ذٰلِكَ بِاَنَّهُمْ شَآقُّوا اللّٰهَ وَرَسُوْلَهٗ وَمَنْ یُّشَاقِقِ اللّٰهَ وَرَسُوْلَهٗ فَاِنَّ اللّٰهَ شَدِیْدُ الْعِقَابِ ۟

Zaalika bi annahum shaaaqqul laaha wa Rasoolah; wa mai yushaqiqil laaha wa Rasoolahoo fa innal laaha shadeedul 'iqaab

“This because they contended against Allah and His Messenger: If any contend against Allah and His Messenger, Allah is strict in punishment.”

Quran 8:13 (Yusuf Ali Translation)