What is Christian observances of Jewish holidays?

Christian observances of Jewish holidays is a practice evidenced since the time of Christ. Specific practices vary among denominations: these holidays may be honored in their original form in recognition of Christianity's Jewish roots or altered to suit Christian theology. Symbolic and thematic features of Jewish services are commonly interpreted in a Christian light: for example, the Paschal Lamb of the Passover Seder is viewed as a symbol of Christ's sacrifice.

As a group these Christians form non-denominational alliances such as Christians for Israel and Christians United for Israel; they also form the root of a global, cross-denominational movement called Messianic Judaism, and of its offshoot known as Hebrew Roots.

A small number of Christian denominations — including the Assemblies of Yahweh, Messianic Jews, some congregations of the Church of God , the World Mission Society Church of God, Hebrew Roots, Pentecostals and a variety of Church of God groups instruct their members to observe the religious holidays described in the Tanakh, but interpreted, they believe, in the light of the New Testament. Some Seventh-day Adventists have also adopted the Jewish holidays against the wishes of the denominational leaders. Most of these denominations also eschew the observance of Christmas and Easter, believing them to be later, pagan corruptions.

Most point to the tradition that Jesus' parents kept God's holy days, that Jesus himself kept God's holy days during his ministry, and that the Apostles observed the same feasts after they were called "Christians". The Book of Acts chapter 2 records that the start of the Christian Church began on a biblical feast day: "And when the day of Pentecost has fully come, they were all with one accord in one place."