California, United States of America
The following excerpt is from Pacific etc. Conference of United Methodist Church v. Court, 147 Cal.Rptr. 44, 82 Cal.App.3d 72 (Cal. App. 1978):
Where a judge gratuitously offers an opinion on a matter not yet pending before him and thereby shows a bias or prejudice against a party, a writ of mandate will issue precluding the opining judge from hearing that matter. (Calhoun v. Superior Court, 51 Cal.2d 257, 261, 331 P.2d 648.)
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