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:5725 – Sūwayd > ʿAbdullāh > Bashīr b. al-Muhājir > Saʾalt al-Ḥasan ʿAmmā Yuṭbakh from al-ʿAṣīr

"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.'"  

النسائي:٥٧٢٥ – 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  

See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:5215 – Sūwayd > Khbrnā ʿAbdullāh > Bashīr b. al-Muhājir > Saʾalt al-Ḥasan ʿAmmā Yuṭbakh from al-ʿAṣīr

[Machine] He said, "What you cook until two-thirds is gone and one-third remains."  

الكبرى للنسائي:٥٢١٥ – أَخْبَرَنَا سُوَيْدٌ قَالَ أخبرنَا عَبْدُ اللهِ عَنْ بَشِيرِ بْنِ الْمُهَاجِرِ قَالَ سَأَلْتُ الْحَسَنَ عَمَّا يُطْبَخُ مِنَ الْعَصِيرِ

فقَالَ «مَا تَطْبُخُهُ حَتَّى يَذْهَبَ الثُّلُثَانِ وَيَبْقَى الثُّلُثُ»