The Triduum begins on the evening of Maundy Thursday.

At that point we enter the most solemn, sorrowful period in the Church calendar followed by the greatest, most joyous of feast days, Easter.

The following posts explain more about the Last Supper:

‘One of you will betray Me’

Passover, the Last Supper and the New Covenant

John MacArthur on Passover as celebrated at the Last Supper

St John’s Gospel has the fullest account of our Lord’s discourse at the Last Supper. What follows are selected passages accompanied by commentary:

John 13:16-20 – why the footwashing is necessary

John 13:36-38 – the promise of afterlife and foretelling Peter’s denial

John 14 – Jesus’s words of comfort

John 16:1-4 – a warning about persecution

John 16:16-24 sorrow will turn into joy

John 16:25-33 overcoming the world

John 17 — the High Priestly Prayer: parts 1, 2 and 3