The Holy Spirit Promised
Jesus promised the Apostles the Holy Spirit, assuring them that He would,

comfort them;

dwell in them (John 14:16,17);

teach them all things;

bring all his teachings to their remembrance (John 14:26);

testify of Jesus (John 15:26,27);

convict the world of sin, righteousness and judgment (John 16:7-11);

and speak through them (Matthew 10:15-20).

The Last Supper
On the night of his betrayal, Jesus instituted a supper to be kept in memory of him--his death and sufferings (Matthew 26:26-30). It was designed,

to keep Him enshrined in the hearts of His disciples to the end of time;

to proclaim His death until he comes again (1 Corinthians 11:23-29).

Agony in the Garden
After the supper Jesus went to the garden of Gethsemane where, under the mighty weight of the world's sins, He cried to His Father to let the cup of sorrow and suffering pass, but expressed his willingness to submit to the terrible ordeal (Luke 22:39-46).

Betrayal
Jesus was betrayed by one of His Apostles, Judas Iscariot (Luke 22:47,48).