From Tabor here – Three of our New Testament gospels record Jesus’ Last Supper in which he tells his disciples over bread and wine: “This is my body,” and “This is my blood,” and in the gospel of John Jesus speaks of “eating my flesh” and “drinking my blood.” These writers based their accounts of Jesus’ final meal on Paul, directly quoting what he had written in his letters almost word-for-word (Mark 14:22-25; Matthew 26:26-29; Luke 22:15-20; John 6:52-56; 1 Corinthians 11:23-26). This is one of the strongest indications that the New Testament gospels are essentially Pauline documents, with underlying elements of the earlier Jesus tradition. (Emphasis mine.)
1 Corinthians 11:23-26 NRSV
23 For I received from the Lord what I also handed on to you, that the Lord Jesus on the night when he was betrayed took a loaf of bread, 24 and when he had given thanks, he broke it and said, “This is my body that is for[f] you. Do this in remembrance of me.” 25 In the same way he took the cup also, after supper, saying, “This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me.” 26 For as often as you eat this bread and drink the cup, you proclaim the Lord’s death until he comes.