By the first century A.D., the Passover service had the hymns, hand washing and four cups of wine. They were in a reclining position, so John could virtually lean on the Master's breast. Luke mentions two of the four cups, the first and the third. Early Jewish tradition says these were the most important. The first cup was special because it consecrated the entire Passover service that followed.
Tradition says that the third cup was the most important of all.
Followers of the Watchtower movement keep the annual Passover on Nisan 14 with the bread and wine. Verses 4-5 show that the Savior rose from supper and washed the disciples' feet. A poor translation is to blame for this misunderstanding. So the footwashing was not after the bread and wine, but before them, during the Passover meal. Washing was preparatory to receiving the unleavened bread.