ذٰلِكَ بِأَنَّهُم قالوا لِلَّذينَ كَرِهوا ما نَزَّلَ اللَّهُ سَنُطيعُكُم في بَعضِ الأَمرِ ۖ وَاللَّهُ يَعلَمُ إِسرارَهُم

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