Origen Commentary on John Book X Another feature of the Jewish festival is unleavened bread; all leaven is made to disappear out of their houses; but "we keep the feast[47] Origen Commentary on Matthew Book XII " It is the mark of the clear-sighted and careful to separate the leaven of the Pharisees and Sadducees and every food that is not of "the unleavened-bread of sincerity and truth"[37]