Q: The app I’m using for Mass says that there’s a creed throughout the weekdays of the octave of Christmas. Is that correct?
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A: No. The best place to look is the missal, where you’ll see a note to include the Gloria, but nothing about a creed.
Sometimes apps are wr1ong. Sometimes the ordos are wrong. Golly, sometimes I’m wrong too. But the missal is pretty reliable.