The Book of Drinks
51/53. Chapter:
What Kind of Thickened Grape Juice is Permissible to Drink and What Kind is Not Permitte
Sunan an-Nasai
أَخْبَرَنَا سُوَيْدٌ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنْ بَشِيرِ بْنِ الْمُهَاجِرِ، قَالَ سَأَلْتُ الْحَسَنَ عَمَّا يُطْبَخُ مِنَ الْعَصِيرِ قَالَ مَا تَطْبُخُهُ حَتَّى يَذْهَبَ الثُّلُثَانِ وَيَبْقَى الثُّلُثُ .
It was narrated that Bushair bin Al-Muhajir said: "I asked Al-Hasan about juice that has been cooked. He said: 'That which has been cooked until two-third of it has gone and one-third is left.'"
Reference : Sunan an-Nasa'i 5725In-book reference : Book 51, Hadith 187English translation : Vol. 6, Book 51, Hadith 5728