ENOfficial
Abu Raja' said: "I asked Al-Hasan about At-Tila' (thickened grape juice) that has been reduced to half. He said: 'Do not drink it.'"
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا سُوَيْدٌ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنْ يَزِيدَ بْنِ زُرَيْعٍ، قَالَ حَدَّثَنَا أَبُو رَجَاءٍ، قَالَ سَأَلْتُ الْحَسَنَ عَنِ الطِّلاَءِ الْمُنَصَّفِ، فَقَالَ لاَ تَشْرَبْهُ .
sunnah.com