Corpus of Electronic Texts Edition
De controversia Paschali (Author: Cummianus Hibernus)
paragraph 5
Again searching around, I also found Origen 'the bronze-bellied' and truly 'the Staunch' saying: There is indeed a solemn day in the First Month: on the one hand there is the solemnity of the Pasch, and on the other, the solemnity of unleavened bread, although the solemnity of the Pasch seems
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joined to the unleavened bread, for the beginning of the unleavened bread is joined to the end of the Pasch. However, it is that day alone on which the lamb is killed that is called the Pasch. The rest, indeed, are called the seven days of unleavened bread.’’Origenes-Rufinus, Homilia in Leviticum 9:5 (GCS 29: 246)
For so He says: You shall keep the solemnity of unleavened bread for seven days.’’Exod. 23:15 (V)