The Importance of Achdus

Rashi notes a strange bit of math in Bechukosai: five will chase a hundred, but a hundred will chase ten thousand, not two thousand. Why does the number jump instead of growing evenly? And why does Rashi say Bnei Yisrael camped at Har Sinai "as one person with one heart," when the pasuk already uses a singular verb? Rav Chaim Shmulevitz explains what happens to our strength when we stand together, and why Purim carries something Matan Torah did not. Every relationship in a home, a shul or a community is part of the picture.