"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."  

صَلَّيْتُ مَعَ النَّبِيِّ ﷺ بِالْمَدِينَةِ ثَمَانِيًا جَمِيعًا وَسَبْعًا جَمِيعًا أَخَّرَ الظُّهْرَ وَعَجَّلَ الْعَصْرَ وَأَخَّرَ الْمَغْرِبَ وَعَجَّلَ الْعِشَاءَ  

It was narrated from Ibn 'Abbas that he prayed Al-Uula (Zuhr) and 'Asr together in Al-Basrah with nothing in between them, and he prayed Maghrib and 'Isha' together with nothing in between them. He did that because he was busy and Ibn 'Abbas said that he had prayed Zuhr and 'Isha' together with the Messenger of Allah ﷺ in Al-Madinah, eight Rak'ahs with nothing in between.  

أَنَّهُ صَلَّى مَعَ رَسُولِ اللَّهِ ﷺ بِالْمَدِينَةِ الأُولَى وَالْعَصْرَ ثَمَانِ سَجَدَاتٍ لَيْسَ بَيْنَهُمَا شَىْءٌ