How did the Jewish religious year influence the Christian church year?

The Jewish religious year served as the foundational framework for the Christian church year, providing both its structural calendar and its theological focus on historical commemoration.1

Key influences include:

• The Seven-Day Week: The church adopted the Jewish seven-day week, eventually establishing Sunday as the "Lord’s Day" to commemorate the Resurrection of Christ.2
• Passover and Easter: Early Christians initially celebrated the Lord’s Passover concurrently with the Jewish feast. By the 2nd century, most churches shifted this observance to the Sunday following the Jewish festival, eventually becoming Easter. The imagery of the "Lamb of God" is also derived from the Jewish Passover ritual.32
• Pentecost: The Christian Pentecost, which concludes the 50-day period following Easter, was modeled after the Jewish harvest festival of Shavuot. While Shavuot commemorates the revelation of the Torah at Mount Sinai, Pentecost marks the descent of the Holy Spirit.42

Through these celebrations, the church transformed the Jewish practice of reliving saving events into a cycle centered on the life, death, and resurrection of Jesus.12