Today we celebrate the Institution of the Eucharist at the Last Supper:

"And as they were eating, He took bread, and blessed , and broke it, and gave it to them, and said, "Take; this is my body." And He took a cup, and when He had given thanks He gave it to them, and they all drank of it. And He said to them, "This is my blood of the covenant, which is poured out for many."

- Mark 14: 22-24