Maundy Thursday in the context of "Easter Triduum"

The Last Supper is the final meal that, in the Gospel accounts, Jesus shared with his apostles in Jerusalem before his crucifixion. The Last Supper is commemorated by Christians especially on Holy Thursday. The Last Supper provides the scriptural basis for the Eucharist, also known as "Holy Communion" or "The Lord's Supper". Jesus having a final meal with his disciples is almost beyond dispute among scholars, and belongs to the framework of the narrative of Jesus' life.

The New Testament mentions the Last Supper in four of its books. The First Epistle to the Corinthians (I Cor. 11:23–25) contains the earliest known mention. The four canonical gospels state that the Last Supper took place in the week of Passover, days after Jesus's triumphal entry into Jerusalem, and before Jesus was crucified on Good Friday (Matthew 26:17–29; Mark 14:12–25; Luke 22:7–38). During the meal, Jesus predicts his betrayal by one of the apostles present, and foretells that before the next morning, Peter will thrice deny knowing him.

Easter, also called Pasch (/pæsk/) or Pascha (Aramaic: פַּסְחָא , paskha; Greek: πάσχα, páskha) or Resurrection Sunday, is a Christian festival and cultural holiday commemorating the resurrection of Jesus from the dead, described in the New Testament as having occurred on the third day of his burial following his crucifixion by the Romans at Calvary c. 30 AD. It is the culmination of the Passion of Jesus, preceded by Lent (or Great Lent), a 40-day period of fasting, prayer, and penance.

Easter-observing Christians commonly refer to the last week of Lent, before Easter, as Holy Week, which in Western Christianity begins on Palm Sunday (marking the entrance of Jesus in Jerusalem), includes Spy Wednesday (on which the betrayal of Jesus is mourned), and contains the days of the Easter Triduum including Maundy Thursday, commemorating the Maundy and Last Supper, as well as Good Friday, commemorating the crucifixion and death of Jesus. In Eastern Christianity, the same events are commemorated with the names of days all starting with "Holy" or "Holy and Great", and Easter itself might be called Great and Holy Pascha. In both Western and Eastern Christianity, Eastertide—also known as the Easter or Paschal season—begins on Easter Sunday and continues for seven weeks, concluding on the 50th day, Pentecost Sunday. However, in Eastern Christianity, the leavetaking of the feast occurs on the 39th day, the eve of the Feast of the Ascension.

Holy Week (Koine Greek: Ἁγία καὶ Μεγάλη Ἑβδομάς, romanized: Hagía kaì Megálē Hebdomás, lit. 'Holy and Great Week') commemorates the seven days leading up to Easter. It begins with the commemoration of Christ's triumphal entry into Jerusalem on Palm Sunday, marks the betrayal of Jesus on Spy Wednesday (Holy Wednesday), climaxing with the commemoration of the Last Supper on Maundy Thursday (Holy Thursday) and the Passion of Jesus on Good Friday (Holy Friday). Holy Week concludes with Christ's death and descent into hell on Holy Saturday. For all Christian traditions, it is a moveable observance. In Eastern Christianity, which also calls it Great Week, it is the week following Great Lent and Lazarus Saturday, starting on the evening of Palm Sunday and concluding on the evening of Great Saturday. In Western Christianity, Holy Week is the sixth and last week of Lent, beginning with Palm Sunday and concluding on Holy Saturday.

Christians believe that Jesus rested in death from the ninth hour (3 pm) on Good Friday until just before dawn on Sunday morning, the day of his resurrection from death, known as Easter Sunday. However, in 1 Peter 3:19, there may be a clue as to a task Jesus performed during this period between death and resurrection: "By which also he went and preached unto the spirits in prison." This marks the beginning of the season of Eastertide, with its first week being known as Easter Week (or Bright Week).

The Feast of the Ascension of Jesus Christ (also called the Solemnity of the Ascension of the Lord, Ascension Day, Ascension Thursday; or sometimes Holy Thursday, which can also mean the Thursday before Easter) commemorates the Christian belief of the bodily Ascension of Jesus into Heaven. It is one of the ecumenical (shared by multiple denominations) feasts of Christian churches, ranking with the feasts of the Passion and Pentecost. Following the account of Acts 1:3 that the risen Jesus appeared for 40 days prior to his Ascension, Ascension Day is traditionally celebrated on a Thursday, the fortieth day of Easter according to inclusive counting, although some Christian denominations have moved the observance to the following Sunday, sometimes called Ascension Sunday. The day of observance varies by ecclesiastical province in many Christian denominations, as with Lutherans and Catholics, for example.

Ascensiontide refers to the ten-day period between the Feast of the Ascension and the Feast of Pentecost. The Sunday within that period may be referred to as the Seventh Sunday of Easter or the Sunday in Ascensiontide.

Lent (Latin: Quadragesima, 'Fortieth') is the solemn Christian religious observance in the liturgical year in preparation for Easter. It echoes the 40 days Jesus spent fasting in the desert and enduring temptation by Satan, according to the Gospels of Matthew, Mark and Luke, before beginning his public ministry. Lent is usually observed in the Catholic, Lutheran, Moravian, Anglican, United Protestant and Orthodox Christian traditions, among others. A number of Anabaptist, Baptist, Methodist, Reformed (including certain Continental Reformed, Presbyterian and Congregationalist churches), and nondenominational Christian churches also observe Lent, although many churches in these traditions do not.

Which days are enumerated as being part of Lent differs between denominations (see below), although in all of them Lent is described as lasting for a total duration of 40 days, the number of days Jesus, as well as Moses and Elijah, went without food in their respective fasts. In Lent-observing Western Christian denominations, Lent begins on Ash Wednesday and ends approximately six weeks later; depending on the Christian denomination and local custom, Lent concludes either on the evening of Maundy Thursday (Holy Thursday), or at sundown on Holy Saturday when the Easter Vigil is celebrated, though in either case, Lenten fasting observances are maintained until the evening of Holy Saturday. Sundays may or may not be excluded, depending on the denomination. In Eastern Christianity – including Eastern Orthodox, Eastern Catholics, Eastern Lutherans, and Oriental Orthodox – Great Lent is observed continuously without interruption for 40 days starting on Clean Monday and ending on Lazarus Saturday before Holy Week.

Maundy (from Old French mandé, from Latin mandatum meaning "command"), or Washing of the Saints' Feet, Washing of the Feet, Nipter, or Pedelavium or Pedilavium, is a religious rite observed by various Christian denominations. The word mandatum is the first word of the Latin Biblical quotation sung at the ceremony of the washing of the feet: "Mandatum novum do vobis ut diligatis invicem sicut dilexi vos", from the text of John 13:34 in the Vulgate ("I give you a new commandment, That ye love one another as I have loved you", John 13:34). The ceremony commemorates the commandment of Christ that his disciples should emulate his loving humility in the washing of the feet (John 13:14–17). The medieval Latin term mandatum (mandé, maundy), came to apply to the rite of foot-washing on the Thursday preceding Easter Sunday, known in English as "Maundy Thursday" since at least 1440 (written as Maunde þursday).

John 13:2–17 recounts Jesus' performance of this action. In verses 13:14–17, Christ instructs His disciples: