The practice of vipassana is Sila, Samadhi and Pañña. Sila (morality) provides the foundation of development for Samadhi (the concentration of the mind). And the purification of the mind is achieved with Pañña (the wisdom of kabbalistic vision).
When you enter the retreat, you should follow these guidelines:
Refrain from killing any creature or living thing.
Refrain from stealing.
Refrain from all sexual activity.
Refrain from lying.
Refrain from taking drugs, smoking or drinking alcohol.