betrayal of faith

ذَٰلِكَ بِأَنَّهُمْ قَالُوا۟ لِلَّذِينَ كَرِهُوا۟ مَا نَزَّلَ ٱللَّهُ سَنُطِيعُكُمْ فِى بَعْضِ ٱلْأَمْرِ ۖ وَٱللَّهُ يَعْلَمُ إِسْرَارَهُمْ

That is because they said to those who disliked what Allāh sent down, "We will obey you in part of the matter." And Allāh knows what they conceal.