Parashat Para deals with the issue of tum’at met. The Haftara goes an additional step to compare sin to tuma (impurity) and uses the metaphor of tuma and tahara to relate to the sins and purification process  of Bnei Yisrael. Interestingly, the beginning of the haftara relates not to tumat met, but to nidda.  We compare the two types of impurity found in Vayikra and Bemidbar. We end with a message of hope that relates to the regular Parasha (Ki Tisa)-about the rehabilitation of the relationship between God and Israel after the Sin of the Golden Calf.