It was narrated that Ibn 'Abbas said: The Messenger of Allah (ﷺ) prayed Zuhr and 'Asr together, and Maghrib and 'Isha' together, when there was no fear and he was not traveling.
It was narrated from Ibn 'Abbas that the Prophet (ﷺ) used to pray in Al-Madinah combining two prayer. Joining Zuhr and 'Asr, and Maghrib and 'Isha', when there was no fear nor rain. It was said to him: Why? He said: So that there would not be any hardship on his Ummah.
It was narrated that Ibn 'Abbas said: I prayed behind the Messenger of Allah (ﷺ) eight (Rak'ahs) together and seven (Rak'ahs) together.