Musnad Ahmad 1153:274

Yahya narrated to us, from Shu'bah, Sa'd ibn Ibrahim narrated to us, and Ibn Ja'far narrated to us, Shu'bah narrated to us, from Sa'd ibn Ibrahim, from Nafi', Ibn Ja'far said: from a person, from 'Aishah, from the Prophet, peace and blessings of Allah be upon him, who said: "Indeed, the grave has a squeeze. If anyone were to be saved from it, Sa'd ibn Mu'adh would have been saved from it."