Musnad Ahmad 1153:646

Muhammad ibn Ja‘far narrated to us, he said: Shu‘bah narrated to us, from Sa‘d ibn Ibrahim, from Nafi‘, from a person, from ‘Aishah, that she said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, the grave has a squeeze. If anyone were to be saved from it, Sa‘d ibn Mu‘adh would have been saved."