﴿ يُسْقَوْنَ مِن رَّحِيقٍۢ مَّخْتُومٍ ﴾

“They will be given a drink of pure wine whereon the seal [of God] will have been set,”

as they are given to drink a nectar a wine free of any impurities that is sealed in its vessel none other than them breaking its seal