What is the requirement for a retired judge to sit and act as a judge of a High Court according to this context?
The requirement for a retired judge to sit and act as a judge of a High Court according to this context is that the National Judicial Appointments Commission, on a reference made by the Chief Justice of a High Court for any State, with the previous consent of the President, may request any person who has held the office of a Judge of that Court or of any other High Court to sit and act as a Judge of the High Court for that State. The retired judge must also consent to sit and act as a Judge in order to do so.