Sunan an-Nasa'i 589
سنن النسائي#589Sahihأَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرٍو، عَنْ جَابِرِ بْنِ زَيْدٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ صَلَّيْتُ مَعَ النَّبِيِّ صلى الله عليه وسلم بِالْمَدِينَةِ ثَمَانِيًا جَمِيعًا وَسَبْعًا جَمِيعًا أَخَّرَ الظُّهْرَ وَعَجَّلَ الْعَصْرَ وَأَخَّرَ الْمَغْرِبَ وَعَجَّلَ الْعِشَاءَ .
It was narrated that Ibn 'Abbas said:"I prayed with the Prophet (ﷺ) in Al-Madinah, eight together and seven together. He delayed Zuhr and brought 'Asr forward, and he delayed Maghrib and brought 'Isha' forward
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 6:96