Números 9

Números 9:11

Those who also lived farther off or had been unclean in soul were commanded to celebrate the pasch in the second month. This is understood as a type of the holy church, which, since it has been defiled by all demons, was seen to be unclean in soul, but cleansed by a saving confession, is commanded to pass over unto a second birth, as if to a second month. However, before the month of new fruits is the last old month, in which it is completely forbidden that the true pasch be held. — LETTER 87.11