This Cup - Luke 22:20

 So Jesus said to Peter, “Put your sword into the sheath. Shall I not drink the cup which My Father has given Me?” - John 18:11

In each of the four accounts of Christ’s arrest in the garden we see Peter’s angst, short temper, and devotion come into play as he swipes his sword at one of those involved. “Then Simon Peter, having a sword, drew it and struck the high priest’s servant, and cut off his right ear. The servant’s name was Malchus.” John 18:10. Perhaps the most revealing words spoken by Jesus to Peter on the occasion were not His admonition to put away the sword, but His question regarding the cup which God the Father had given to Him.
In both Mark’s and Luke’s account of the Agony In the Garden, the writers recount Christ’s words regarding the cup He was to drink from. “And He said, ‘Abba, Father, all things are possible for You. Take this cup away from Me; nevertheless, not what I will, but what You will.’”- Mark 14:36. “And He was withdrawn from them about a stone’s throw, and He knelt down and prayed, saying, “‘Father, if it is Your will, take this cup away from Me; nevertheless not My will, but Yours, be done.’” - Luke 22:41-42.
In his words “this cup” Christ referred to His crucifixion - His horrendous death at the hands of the religious establishment of Judea and a very misguided and jubilant crowd. But despite the enmity of the world there was a purpose - The love of God for us sinners. “In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins.” 1 John 4:10.  Christ wasn’t rebuking Peter for using his sword. He was rebuking Peter’s timing! He was correcting Peter as He had done so on many previous occasions. Peter still did not understand the need for Jesus to die. Reconciliation, was Christ’s purpose in “this cup.” Man’s reconciliation with God, despite Peter’s and mankind’s stubbornness. “For if when we were enemies we were reconciled to God through the death of His Son, much more, having been reconciled, we shall be saved by His life.” - Romans 5:10.  Christ’s death reconciled us to God; Christ’s life of perfect obedience to God was then imputed to us for our salvation.
This cup was offered up for us by Jesus Christ. His precious blood was shed so that we could find forgiveness for our sins  and salvation in no other Name. May we praise our Lord and Savior forever!