The Three Weeks

When during the three weeks can I shave and have a haircut? What are the laws of mourning with regard to shaving?

The Talmud says, “Where it is the custom to do work on the ninth of Av, one may work; where it is the custom not to do work, one may not do work.” However, whoever does work on the Ninth of Av will not see a sign of blessing from that work.

Mourning the Temple's destruction must be internal. A person cannot simply jump into the Ninth of Av. One must enter it gradually in order that his mourning be earnest. Therefore, the intensity of our mourning over the Temple's ruin grows gradually.