AL ANFAAL — Ayat 13

ذَلِكَ بِأَنَّهُمْ شَآقُّواْ اللّهَ وَرَسُولَهُ وَمَن يُشَاقِقِ اللّهَ وَرَسُولَهُ فَإِنَّ اللّهَ شَدِيدُ الْعِقَابِ

That is because they opposed Allah and His Messenger. And whoever opposes Allah and His Messenger - indeed, Allah is severe in penalty.