what does the bible say?
The Old Testament contains details of many holidays that God told His people to observe, including ones like Passover and Yom Kippur. Christians today are under no obligation to observe any Jewish holiday. Neither are they restricted from celebrating a Jewish holiday, as long as they understand that they are saved by grace through faith in Christ alone, not by works or rituals (Ephesians 2:8-9). The Old Testament describes how God instituted the Passover (Exodus 6:6, Exodus 12), requiring lamb's blood to save the Israelites' firstborn from the angel of death. This pointed to Christ, the ultimate sacrificial Lamb through whom forgiveness of sins comes for those who place their faith in Him (John 1:29; 1 Corinthians 5:7). God also instituted the Day of Atonement for His people in the Old Testament (Leviticus 16, 23:26–32). Christians who choose to celebrate Yom Kippur today should be sure not to treat their observance as somehow atoning for their sins; Christ alone has atoned for the sins of those who accept Him as Lord and Savior (Hebrews 10:1-13). Some Jews who have turned to Christ may decide to celebrate Jewish holidays as a matter of history and culture, but no believer should judge another for doing so (Colossians 2:16–17).