Abstract
The study analyses the role of the holy day of Christians in the Early Church. It summarizes the main sources from the beginning of the 2nd century and evaluates them in the perspective of contemporary trends within historical research of this period.
They stem from the justifiable assumptions that separation of the groups of Jesus's disciples from the synagogue of prerabbinic Judaism was much more gradual process realised not until the 2nd century. The study also outlines the main reasons supporting the statement that the link between Sunday and celebration of the resurrection of Jesus was not obvious from the beginning but it was the result of the later theological development.