Dreams involving themes of death, sacrifice, and collective actions can often reflect deep emotional or spiritual conflicts. In your dream, the closed coffin may symbolize something in your life that is unresolved or a situation that is being hidden from view. The wealthy house could represent a façade of success or security, but within it, you witnessed a disturbing ritual that led to destruction.

The human chain and the act of nailing themselves could signify a sense of obligation or peer pressure to conform to certain beliefs or behaviors that do not resonate with you. Your instinct to withdraw suggests an awareness of this misalignment, indicating that you value your individuality and moral stance over conformity.

The burning and melting of the group may represent the consequences of blind adherence to group norms or ideologies, reflecting your fears about losing yourself or the dangers of collective behavior.

The connection to the film "Passion of Christ" may indicate that you are processing feelings of guilt, sacrifice, or the portrayal of suffering in media. If you felt something was wrong with the film, it could suggest that you are questioning traditional narratives or the ways in which suffering and sacrifice are depicted in society.

Overall, this dream encourages you to reflect on your beliefs and the influences around you. Trust your instincts, and be cautious about conforming to group expectations that do not align with your true values. Consider what aspects of your life feel genuine and what might be a façade.