مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3922
Musnad of Abdullah bin Mas'ood
It was narrated that `Abdullah said: The Messenger of Allah (ﷺ) said: “No man in whose heart is pride the size of a grain will enter Paradise, and no man in whose heart is faith the size of a grain will enter Hell.”
Musnad Ahmad 3947Its isnad is saheeh]