Jewish community insiders say Melbourne's ultra-Orthodox Chabad community has banded together to cover up cases of sexual abuse.

Sources have also accused Jewish leaders of intimidating victims, their families and supporters and threatening to expel them from the tight-knit community

One of the global Chabad community's most senior figures has categorically warned at least one victim he could not report allegations of abuse to police, the Herald Sun has confirmed.

The senior rabbi, who was a leader in education for several decades within the Australian Chabad movement, said doing so would ruin the alleged perpetrator's life and would amount to "grave sin" under Jewish law.

Other shocking suggestions made by the rabbi included:

TELLING the victim he had invited the abuse because he wasn't religious enough

SAYING children as young as five were abused because they were obsessed with sex, including with animals

ADMITTING he knew about allegations of abuse by the alleged perpetrator several years before the victim was allegedly abused.