No halal certifiers will appear at Cory Bernardi's upcoming public hearings into food labelling, which has been scheduled for one of Islam's holiest days.

The South Australian Liberal senator instigated an inquiry in May to "get to the bottom" of the halal industry, which he has previously described as a "racket".

More than 800 submissions were made to the inquiry, many of which were striking in their brevity, and echoed Bernardi's concerns that certification was "forced on" retailers or funds terrorism.

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