“Jesus said to them.
‘This is my blood
Of the covenant.
It is poured out
καὶ εἶπεν αὐτοῖς Τοῦτό ἐστιν τὸ αἷμά μου τῆς διαθήκης τὸ ἐκχυννόμενον ὑπὲρ πολλῶ
This is almost word for word in Matthew, chapter 26:28, but Matthew added “the forgiveness of sins” at the end. Luke, chapter 22:20, has a blessing cup before the bread and one after the bread and the supper. Paul spoke about a “new covenant” in I Corinthians, chapter 11:25. In John, chapter 13:53-58, Jesus was preaching about eating and drinking the body and blood of the Son of Man, since there was no institution narrative. Mark indicated that Jesus said to them (καὶ εἶπεν αὐτοῖς) that this was his blood of the covenant (Τοῦτό ἐστιν τὸ αἷμά μου τῆς διαθήκης), that was to be poured out for many people (τὸ ἐκχυννόμενον ὑπὲρ πολλῶ). This blood poured out for many may be an allusion to Isaiah, chapter 53:12. This blessing of the wine had a more elaborate narrative than the bread. However, both would become part of the new developing Christian Eucharistic Communion worship service. Notice that Mark has this statement about the blood of Jesus after they had already drunk the cup. The same could be implied from Matthew also.