When Prophet Mohammed was sent by God to invite people to God alone and to eradicate the idolatry, Jews were supposed to support him, because he preached the First Commandment and then he broke up the idols; Jews were supposed to uphold him as had they been supposed to confirm Jesus Christ before him; but they antagonized either of them.
On the contrary they opposed Prophet Mohammed and broke their covenant with him and preferred to help the idolaters rather than to support him.
Examples:
Quran 4: 51-52
[Abu Sufian asked some of Jews: "What do you think about Mohammed: is he insane or is he a scholar?"
They said: "He is only a scholar that studied [the Torah!]"
He said:" Is he more knowledgeable or are your scholars?"
They said: "Our scholars, particularly the priest Huyay son of Akhtab and Ka'ab son of Ashraf, are more knowledgeable."
He said: "Which is true: his religion or your religion?"
They said: "The true is our religion."
He said: "Is his Quran of his own accord, or is it a revelation from heaven?"
They said: "Had it been any revelation, it would have been revealed to us; for we are more worthy of the revelation than he is; and had it been any prophecy, it would have been within us."
Therefore, this aya was revealed:]
{51. Haven't you [Mohammed] regarded those [Jews] who were given a portion of the [Heavenly] Book [: the Torah], [how] they believe a in the priest [: Huyay, the son of Akhtab] and the tyrant [: Ka'ab, the son of Ashraf], and [how] they say to the disbelievers b: "These [Jewish priests] are more rightly guided than those [Mohammed and his companions] who believe c."
[So God denied their claim, disapproved their words and cursed them in this aya:]
52. It is these [ Jews: Huyay, Ka'ab and their followers] whom God has cursed d;
and anyone whom God curses e, you will not find for him any helper [to save him from God's punishment.]}
...........................................................
a i.e. they believe in their scholars and blindly follow them, even though they are in error, and in spite of that they sanctify them, and in particular the priest Huyay, the son of Akhtab.
b Abu Sufian and his companions, when these asked them: Which has more knowledge: Mohammed or your scholars? So they answered:
c and they have more knowledge than Mohammed and his companions have.
d i.e. God has removed them far away from His mercy and decided that they deserve the punishment.
e i.e. Anyone whom God removes far away from His mercy.
The interpretation is by Mohammed-Ali Hassan Al-Hilly.
On the contrary they opposed Prophet Mohammed and broke their covenant with him and preferred to help the idolaters rather than to support him.
Examples:
Quran 4: 51-52
[Abu Sufian asked some of Jews: "What do you think about Mohammed: is he insane or is he a scholar?"
They said: "He is only a scholar that studied [the Torah!]"
He said:" Is he more knowledgeable or are your scholars?"
They said: "Our scholars, particularly the priest Huyay son of Akhtab and Ka'ab son of Ashraf, are more knowledgeable."
He said: "Which is true: his religion or your religion?"
They said: "The true is our religion."
He said: "Is his Quran of his own accord, or is it a revelation from heaven?"
They said: "Had it been any revelation, it would have been revealed to us; for we are more worthy of the revelation than he is; and had it been any prophecy, it would have been within us."
Therefore, this aya was revealed:]
{51. Haven't you [Mohammed] regarded those [Jews] who were given a portion of the [Heavenly] Book [: the Torah], [how] they believe a in the priest [: Huyay, the son of Akhtab] and the tyrant [: Ka'ab, the son of Ashraf], and [how] they say to the disbelievers b: "These [Jewish priests] are more rightly guided than those [Mohammed and his companions] who believe c."
[So God denied their claim, disapproved their words and cursed them in this aya:]
52. It is these [ Jews: Huyay, Ka'ab and their followers] whom God has cursed d;
and anyone whom God curses e, you will not find for him any helper [to save him from God's punishment.]}
...........................................................
a i.e. they believe in their scholars and blindly follow them, even though they are in error, and in spite of that they sanctify them, and in particular the priest Huyay, the son of Akhtab.
b Abu Sufian and his companions, when these asked them: Which has more knowledge: Mohammed or your scholars? So they answered:
c and they have more knowledge than Mohammed and his companions have.
d i.e. God has removed them far away from His mercy and decided that they deserve the punishment.
e i.e. Anyone whom God removes far away from His mercy.
The interpretation is by Mohammed-Ali Hassan Al-Hilly.