Jesus made preparations for Passover even though He was fully aware that one of His disciples, namely Judas Iscariot would betray Him. Jesus sent two of his disciples and told them to go into the city where they would meet a man carrying a pitcher of water and told them to follow the man until he arrived at a house and they asked the man of the house where Jesus should eat the Passover meal with his disciples. The man showed them a large furnished room and they made everything ready to eat the Passover meal. Jesus knew that one of His disciples would betray Him and gave clues to His disciples about which one of them would be the betrayer.
Jesus knew which of His disciples would betray him as He gave them a clue who the betrayer would be, when he told them that one of the twelve disciples would dip in the dish at the same time as Him.
On the first day of unleavened bread Jesus disciples asked Jesus, where he wanted to go to eat the passover meal. Mark 14:12 NIV
And Jesus sent two of his disciples and said, "Go ye into the city, and there shall meet you a man bearing a pitcher of water, follow him. Mark14:13 NIV
And wheresoever he shall go in, say ye to the goodsman of the house, The Master saith, Where is the guest chamber, where I shall eat the passover with my disciples Mark 14:14 NIV
And he will show you a large upper room furnished and prepared: there make ready for us". Mark 14:15 NIV
And He answered and said unto them. "It is one of the twelve, that dippeth with me in the dish. Mark 14:20
Jesus knew that He would be crucified for the sins of mankind and He knew who would betray Him. Jesus said it would be better for that man (Judas) if he had never been born. As Jesus ate the Passover meal with His disciples, Jesus took bread, blessed it and gave it to His disciples saying, "Take eat: this is my body" and then Jesus revealed to the disciples that one of them would betray Him.
The Son of man indeed goeth, as it is written of him: but woe to that man by whom the Son of man is betrayed! good were it for that man if he had never been born." Mark 14:21
And as they did eat, Jesus took bread, and blessed, and brake it and gave to them and said, "Take, eat: this is my body" Mark 14:22
And as they sat and did eat, Jesus said , "Verily I say unto you, One of you which eateth with me shall betray me." Mark 14:18
The disciples were sad and each began to ask Jesus, "Is it I"?
And they began to be sorrowful, and say unto him one by one, Is it I? and another said, Is it I? Mark 14:19
Jesus knew prior to His death that He would be betrayed by Judas Iscariot because before His death Jesus washed the feet of His disciples and when He was finished He talked to them telling them that one of them would betray Him.
For he knew who should betray him; therefore said he, Ye are not all clean. John 13:11
After washing His disciples feet Jesus again spoke of Judas upcoming betrayal. Read John Chapter 13