مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3306
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas (رضي الله عنه) said: The iqamah for prayer was given and I had not prayed the two rak'ahs. He (the Prophet (ﷺ) saw me when I was praying them and he came close to me and said: "Do you want to pray Fair with four (rak'ahs)?" It was said to Ibn ‘Abbas (رضي الله عنه): From the Prophet (ﷺ)? He said: Yes.
Musnad Ahmad 3329Its isnad is hasan]