Fortunately, St. Luke told us why he wrote his Gospel: "Since many have undertaken to compile a narrative of the events that have been fulfilled among us, just as those who were eyewitnesses from the beginning and ministers of the word have handed them down to us, I too have decided, after investigating everything accurately anew, to write it down in an orderly sequence for you, most excellent Theophilus, so that you may realize the certainty of the teachings you have received."

And after not accurately quoting Jesus' words in John's Gospel, no mention of this being the institution of the Sacrament of Reconcilation.