וצוה הכהן ולקח למטהר שתי צפרים חיות טהרות ועץ ארז ושני תולעת ואזב
The commentators explain that the purification process is all about infusing the metzora with a sense of humility. The cedar wood represents his arrogant nature prior to his sin, with the crimson thread (crimson is the product of a dye taken from a lowly worm), hyssop, a lowly bush, atoning for his previous haughtiness (when these substances are dipped into the blood of the birds). Horav Shimon Schwab, zl (cited by his son in Rav Schwab on Chumash), suggests that these three items: cedar wood, crimson thread and hyssop represent three types of people who need to focus on the…