مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3974
Musnad of Abdullah bin Mas'ood
It was narrated that ‘Abdullah said: I remember the pairs (of soorahs) that the Messenger of Allah (ﷺ) used to put together (in one rakah), eighteen soorahs from al-Mufassal and two soorahs from the family of Ha-Meem.
Musnad Ahmad 3999Its isnad is saheeh, al-Bukhari (5043) and Muslim (822)]