The various versions state that this was a Passover meal. This was the ending of the Old Covenant and the beginning of the New Covenant. It will be noted that in Matthew, Mark, and 1 Corinthians Yahshua took the cup once, while in Luke, He took it once during the meal and once after the meal had been completed. At the end, the men sang a song. Anyone who is familiar with the Passover meal knows that the cup is taken four times, with the last two being after the meal.
Bread is broken and taken after the meal, also.
Then a hymn, consisting of several of the Psalms, is sung. Commentary This was a Passover meal only. There appears to have been changes made in the records some time after the event, as is evident in 1 Corinthians 11. First, the reclining position was changed to a sitting position. Then, omissions were made in regard to the cup.