وَلَوۡ كَانُواْ يُؤۡمِنُونَ بِٱللَّهِ وَٱلنَّبِيِّ وَمَآ أُنزِلَ إِلَيۡهِ مَا ٱتَّخَذُوهُمۡ أَوۡلِيَآءَ وَلَٰكِنَّ كَثِيرٗا مِّنۡهُمۡ فَٰسِقُونَ ٨١
And if they had believed in Allāh and the Prophet and in what was revealed to him, they would not have taken them as allies; but many of them are defiantly disobedient.
Translation: Saheeh International (English)
Each word's meaning and sound
If these Jews had true faith in Allah and His Prophet, they would not have taken the idolaters as their allies instead of the believers, because they were prohibited from taking disbelievers as friends. But most of these Jews do not obey Allah nor do they side with Him and the believers.
Al-Mukhtasar in interpreting the Noble Quran