﴿ فَمِنْهُم مَّنْ ءَامَنَ بِهِۦ وَمِنْهُم مَّن صَدَّ عَنْهُ ۚ وَكَفَىٰ بِجَهَنَّمَ سَعِيرًا ﴾

“and among them are such as [truly] believe in him, and among them are such as have turned away from him. And nothing could be as burning as [the fire of] hell:”

(And of them) of the Jews (were (some) who believed therein) believed in the Scripture of David and Solomon (and of them were (some) who disbelieved therein. Hell is sufficient for (their) burning) i.e. Ka'b and his followers.