Translation of the verse 16 from Surah Al-Insan : Number of verses 31 - - page 579 - Part 29.
Crystal-clear, made of silver. They will determine the measure thereof according to their wishes.
Clear glasses [made] from silver of which they have determined the measure.
(76:16) goblets bright as crystal but made of silver, filled to exact measure. *19
*19) "In due measure": filled accurately according to the desire of every person, neither over-filled nor under-filled. In other words, the attendants of the dwellers of Paradise will be so judicious and discerning that they will have accurate judgement about everybody whom they serve wine as to how much of it he wishes to drink. (For the characteristics of the wine of Paradise, see As-Saaffat: 45-47 and the E.N.'s 24 to 27, Muhammad: 15 and E.N. 22, At-'tur; 23 and E.N. 18, Al-Waqi`ah: 19 and E.N. 10).
Source : Al-Insan Verse 16: Clear glasses [made] from silver of which they have determined the measure.