Today is the feast that commemorates Our Lord's Last Supper with His disciples, when He instituted the Mass and Holy Eucharist as He celebrated the Passover meal with them.
During the meal Jesus took bread, blessed it, broke it, and gave it to his disciples. "Take this and eat it," he said, "this is my body." Then he took a cup, gave thanks, and gave it to them. "All of you must drink from it," he said, "for this is my blood, the blood of the covenant, to be poured out in behalf of many for the forgiveness of sins." (Matt. 26: 26-28)