Camphor
'The righteous drink from a cup whose mixture is camphor — a spring at which God's servants drink, making it gush forth as they will': the cool of camphor the mixture of the righteous' cup.
In the Qur'an · 1
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إِنَّ ٱلْأَبْرَارَ يَشْرَبُونَ مِن كَأْسٍ كَانَ مِزَاجُهَا كَافُورًا
Lo! the righteous shall drink of a cup whereof the mixture is of Kafur,