Allah says,

﴿وَيُسْقَوْنَ فِيهَا كَأْساً كَانَ مِزَاجُهَا زَنجَبِيلاً ﴾

(And they will be given to drink there of a cup mixed with Zanjabil (ginger),) meaning, they -- the righteous -- will also be given a drink from these cups.

﴿كَأْساً﴾

(a cup) meaning, a drink of wine.

﴿كَانَ مِزَاجُهَا زَنجَبِيلاً﴾

(mixed with Zanjabil (ginger),) So on one occasion they will be given a drink that is mixed with camphor, and it is cool. Then on another occasion they will be given a drink mixed with ginger, and it is hot. This is so that their affair will be balanced. However, those who are nearest to Allah, they will drink from all of it however they wish, as Qatadah and others have said. The statement of Allah has already preceded which says,

﴿عَيْناً يَشْرَبُ بِهَا عِبَادُ اللَّهِ﴾

(A spring wherefrom the servants of Allah will drink.) (76:6) And here Allah says,

﴿عَيْناً فِيهَا تُسَمَّى سَلْسَبِيلاً ﴾

(A spring there, called Salsabil.) `Ikrimah said, "It (Salsabil) is the name of a spring in Paradise.'' Mujahid said, "It is called this due to its continuous flowing and the severity of its current.''