The parashah tells us about Yom Kippur, the holiest day of the year. On this day, we don't drink, eat, bathe, or wear leather shoes. It's not difficult to feel holy on this very special day, when so many things are different. However, the name of the parashah is Acharei, which means "after," because a Jewish He should not feel holy only on Yom Kippur, but also afterwards, throughout the year.
What is a holy person like?
Some believe that a holy person lives far from the city. There, in peace and quiet, they can focus on becoming a better person. They might dress differently from others, or fast, or eat a very simple diet. They also shouldn't participate in things happening outside their home and spend most of their time thinking and praying.
But this is not what the Torah tells us is holy. Quite the opposite! The Torah tells us to be holy and connects this commandment with mitzvot that have to do with food, clothing, marriage, business, agriculture, and other things. When we prepare food in the way God commanded us, we become holy. When we sew clothes as God commanded, we become holy. When we conduct our business as God wants, we become holy.
We don't need to withdraw from daily life or from people to be holy. We must be involved in everyday things, but in the way that HaShem wants.
HaShem tells us, "Be holy, for I am holy." He infuses holiness into everything that exists—clothes, food, and business. If we do these things according to the Torah, then we reveal the holiness that HaShem placed within them. That makes us holy.
Extracted from Please tell me what the Rebbe says.