Maundy Thursday, also called Holy Thursday, is a service to commemorate Jesus' Last Supper and the beginning of the sacrament of the Lord's Supper.
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First, Jesus celebrated the Last Supper with His disciples and instituting the Lord’s Supper, also called Communion (Luke 22:19-20). Some Christian churches observe a special Communion service on Maundy (Holy) Thursday in memory of Jesus’ Last Supper with His disciples. Second, Jesus washed the disciples’ feet as an act of humility and service, setting an example that we should love and serve one another in humility (John 13:3-17). Some Christian churches observe a foot-washing ceremony on Maundy Thursday to commemorate Jesus’ washing the feet of the disciples.
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The word Maundy is derived from the Latin word for command. The Maundy in Maundy Thursday refers to the command Jesus gave to the disciples at the Last Supper, that they should love and serve one another.