مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3294
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: We travelled with the Prophet (ﷺ) between Makkah and Madinah and we were safe, not fearing anything, and he offered the prayers with two rak'ahs.
Musnad Ahmad 3317A saheeh hadeeth]