Holy Thursday is when Jesus and his disciples have the Last Supper. Before they eat Jesus washes the disciple's feet, he did this simple act to show that unless they be washed of their sins, they cannot inherit the kingdom of God. During the Last Supper Jesus takes a cup and gave thanks “Take this, and divide it among yourselves. 18 For I tell you that from now on I will not drink of the fruit of the vine until the kingdom of God comes.” and he took some bread, gave thanks and broke it and gave it out saying “This is my body, which is given for you. Do this in remembrance of me.” then Jesus tells his disciples that one of then would betray him not mentioning who causing the disciples question each other to find out who would betray Jesus.
In church on holy Thursday the priest washes the feet of 12 people who are members of the church and performs the sacrament of the Eucharist.