WHY IS PENTECOST SOMETIMES CALLED “WHITSUNDAY”?
A tradition of some churches in ancient times was to baptize adult converts to the faith on Pentecost. The newly baptized catechumens would wear white robes on that day, so Pentecost was often called “Whitsunday” or “White Sunday” after these white baptismal garments. Many Christian calendars, liturgies, and hymnals (particularly those from the Episcopal/Anglican tradition) still use this term.
