Right here....
Matthew 26:27-29 And he took a cup, and when he had given thanks he gave it to them, saying, “Drink of it, all of you, for this is my blood of the covenant, which is poured out for many for the forgiveness of sins. I tell you I will not drink again of this fruit of the vine until that day when I drink it new with you in my Father's kingdom.”
A couple things to consider.
One is that Jesus had to participate in the Passover as any observant Jew would have to remain without sin.
That would include not eating of blood, which would have broken God's clear commandments and thereby sinning, which would have rendered Him incapable of being the lamb of God who takes away the sin of the world.
The only reason His death was able to conquer sin and death is because He was sinless.
1 Corinthians 15:56 The sting of death is sin, and the power of sin is the law.
This says He gave the cup of His blood to those who were with Him at table; it does not say He drank it Himself. The fact that He said He would not drink of the fruit of the vine again, means He had drunk of the fruit of the vine earlier in the Passover meal. It does not mean He had drunk of the cup of His Blood which He gave to the disciples.