مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1917
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
Jabir bin Zaid narrated that he heard Ibn ‘Abbas say: I prayed with the Prophet (ﷺ) eight (rak"ahs) together and seven (rak"ahs) together. I [the narrator] said: O Abush-Sha"tha", I think he delayed Zuhr and hastened ‘Asr, and he delayed Maghrib and hastened "Isha". He said: I think so too.
Musnad Ahmad 1918lts israd is Sahih, al-Bukhari (1147) and Muslim (705)]