Surah Al-Ma'idah...
Surely evil is that which their selves send before for them (as their storage in the Hereafter), and Allah's wrath is on them, and in the chastisement shall they abide." In this verse, another evidence upon the behaviour of the Israelites is suggested as a cause that they were cursed for. The Children of Israel make friends and master ship with the disbelievers. So, the acceptance of the master ship of infidels is a cause for bringing forth the wrath of Allah (s.w.t.).
"And if they had believed in Allah and the Prophet and what was sent down to him, they would not have taken them for friends, but, most of them are evil-doers." There may be several extensions for the content of this verse. Among them are the followings: A. If the Jews had really believed in Moses (as) and his Torah, they would never have appointed pagans as their masters. (Tafsir 'Alusi) B. If infidels and polytheists became Muslims; the Jews would not cooperate with them. (Tafsir-i-Al-Mizan) C.
If the People of the Book, or the hypocrites, or the Muslims believed truly in Allah and the Messenger, they would not appoint pagans as their masters. The reason of it is that Faith does not adapt to infidelity. It is corruption and disbelief that cause them to accept the domination of pagans. And, generally, whoever violates the bounds of Allah will be a prey of Taghuts (deities) and disbelievers.