On the first day of the Festival of Unleavened Bread, when it was customary to sacrifice the Passover lamb, Jesus’ disciples asked him, “Where do you want us to go and make preparations for you to eat the Passover?”
References for Mark 14:12
So he sent two of his disciples, telling them, “Go into the city, and a man carrying a jar of water will meet you. Follow him.
Say to the owner of the house he enters, ‘The Teacher asks: Where is my guest room, where I may eat the Passover with my disciples?’
He will show you a large room upstairs, furnished and ready. Make preparations for us there.”
References for Mark 14:15
The disciples left, went into the city and found things just as Jesus had told them. So they prepared the Passover.
When evening came, Jesus arrived with the Twelve.
While they were reclining at the table eating, he said, “Truly I tell you, one of you will betray me—one who is eating with me.”
They were saddened, and one by one they said to him, “Surely you don’t mean me?”
“It is one of the Twelve,” he replied, “one who dips bread into the bowl with me.
References for Mark 14:20
The Son of Man will go just as it is written about him. But woe to that man who betrays the Son of Man! It would be better for him if he had not been born.”
References for Mark 14:21