﴿ يُطَافُ عَلَيْهِم بِكَأْسٍۢ مِّن مَّعِينٍۭ ﴾

“A cup will be passed round among them [with a drink] from unsullied springs,”

they are served from all round each one of them is so served with a cup ka’san this denotes the vessel with the drink in it from a spring of wine that flows along the ground like streams of water