Is it permissible for the judge to host or coach one litigant privately?

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It is not appropriate for the judge to host one litigant without the other; rather, he should host them both or neither. This is supported by the narration that 'Ali, may Allah be pleased with him, turned away a man who approached him alone, stating he heard the Messenger of Allah, peace be upon him, say: 'Do not host one of two litigants unless his opponent is present with him.' This is because hosting one privately suggests the judge’s inclination toward that person to the other litigant. Furthermore, the judge must not prompt one litigant with their argument or advise them on what harms their opponent, such as prompting a confession to be denied, or prompting silence when an oath is due, or prompting an oath when silence is appropriate, or encouraging a hesitant witness to testify, or discouraging one who is ready to testify, or speaking to one litigant alone.