Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai-kubra:5213 – Aḥmad b. Khālid > Maʿn > Muʿāwiyah b. Ṣāliḥ > Yaḥyá b. Saʿīd > Saʿīd b. al-Musayyib

"When At-Tila' (thickened grape juice) has been cooked and reduced to one-third, then there is nothing wrong with it." (Using translation from Nasāʾī 5723)  

الكبرى للنسائي:٥٢١٣ – أَخْبَرَنَا أَحْمَدُ بْنُ خَالِدٍ عَنْ مَعْنٍ قَالَ حَدَّثَنَا مُعَاوِيَةُ بْنُ صَالِحٍ عَنْ يَحْيَى بْنِ سَعِيدٍ عَنْ سَعِيدِ بْنِ الْمُسَيِّبِ قَالَ

«إِذَا طُبِخَ الطِّلَاءُ عَلَى الثُّلُثِ فَلَا بَأْسَ بِهِ»  

See similar narrations below:

Collected by Nasāʾī
nasai:5723 – Aḥmad b. Khālid > Maʿn > Muʿāwiyah b. Ṣāliḥ > Yaḥyá b. Saʿīd > Saʿīd b. al-Musayyab

"When At-Tila' (thickened grape juice) has been cooked and reduced to one-third, then there is nothing wrong with it."  

النسائي:٥٧٢٣ – أَخْبَرَنَا أَحْمَدُ بْنُ خَالِدٍ عَنْ مَعْنٍ قَالَ حَدَّثَنَا مُعَاوِيَةُ بْنُ صَالِحٍ عَنْ يَحْيَى بْنِ سَعِيدٍ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ قَالَ

إِذَا طُبِخَ الطِّلاَءُ عَلَى الثُّلُثِ فَلاَ بَأْسَ بِهِ