مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2572
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn 'Abbas (رضي الله عنه) that The Messenger of Allah (ﷺ) married Maimoonah when he was in ihram.
Musnad Ahmad 2587Saheeh, because of corroborating evidence, its isnad is hasa