Among many things, Parshat Emor lays down instructions for the Kohanim (Priests) to remain holy. Instructions include not coming in contact with dead bodies, and growing their beards and hair (21:1-5). Recanati (13th Century) points out an interesting difference between the instructions for the Kohamin to remain “holy”, and those of the Levites to be “pure”. What is the difference, and why?
Recanati goes on to explain that being pure is simply a result of avoiding anything unclean, while being holy is an active quality of setting yourself apart. The Levites had to shave their hair, while the Kohanim grew it because ridding yourself of impurity requires shedding the past, while being holy requires working on yourself for the future. As a people, we need to be both pure AND holy, and learn to merge the past with our future.