Prohibition of defending wrongdoers

وَلَا تُجَـٰدِلْ عَنِ ٱلَّذِينَ يَخْتَانُونَ أَنفُسَهُمْ ۚ إِنَّ ٱللَّهَ لَا يُحِبُّ مَن كَانَ خَوَّانًا أَثِيمًا

And do not argue on behalf of those who deceive themselves. Indeed, Allāh loves not one who is a habitually sinful deceiver.