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The Thursday before Easter is called Maundy Thursday. Christians commemorate the Last Supper with special services that sometimes include a ritual washing of the feet. Some religious denominations call this Holy Thursday.
Maundy comes from the Latin word meaning "command" or "order" it's an etymological cousin to mandate. It echoes the words spoken by Jesus to his disciples after washing their feet at the Last Supper, "a new commandment I give unto you, that ye love one another" (John 13:34 Authorized Version).