Families of patients who are dying have a key role in decisions regarding do-not-resuscitate orders. The objective of this study was to explore the aspects and characteristics of this decision by the families of Muslim patients with cancer. This study is a conventional content analysis. Eighteen families who met the inclusion criteria participated in this study and were selected by purposive sampling. Data collection was done by a semistructured interview (each interview was 60-110 minutes). The data analysis was performed using content analysis. The data analysis introduced 4 main categories and 8 subcategories: (a) feeling duality (“sacrifice against selfishness,” and “logic against emotion”), (b) religious beliefs (“guilt” and “miracle”), (c) stigmatized (“purgatory talk” and “family rejection”) and (d) decision-making mediators (“religious clergymen” and “the application of the deceased”). Maybe, since the effect of religion in Iran is more significant than other elements such as ethnicity and law, it is possible to receive help from clergymen. It seems necessary for Iran's Ministry of Health and Medical Education to plan clinical guidelines in this context.