A.T. Robertson Commentary Matthew 26:20

"Now when even was come, he was sitting at meat with the twelve disciples;" — Matthew 26:20 (ASV)

He was sitting at meat (ανεκειτο). He was reclining, lying back on the left side on the couch with the right hand free. Jesus and the Twelve all reclined. The paschal lamb had to be eaten up entirely (Exodus 12:4,43).