(Lo! those who disbelieve after their (profession of) belief…) [3:90].
Said al-Hasan, Qatadah and ‘Ata’ al-Khurasani: “This was revealed about the Jews who disbelieved in Jesus and the Gospel and added to their disbelief by disbelieving in Muhammad and the Qur’an”.
And Abu’l-‘Aliyah said: “This was revealed about the Jews and Christians who disbelieved in Muhammad, Allah bless him and give him peace, after they had believed in his attributes and description, and then added to their disbelief by remaining disbelievers”.
Asbab Al-Nuzul by Al-Wahidi , trans. Mokrane Guezzou