And ye shall say unto the goodman of the house, The Master saith unto thee, Where is the guestchamber, where I shall eat the passover with my disciples?
The penitents were to be able to join in the Easter celebrations;therefore they had to be "reconciled" on the day before the Paschal Triduum began, that is, on Maundy Thursday.
And wheresoever he shall go in, say ye to the goodman of the house, The Master saith, Where is the guestchamber, where I shall eat the passover with my disciples?