Nafi' (may Allah have mercy on him) said: We came to Safiyyah bint Abi Ubayd (may Allah have mercy on her), and she narrated to us that the Messenger of Allah (peace and blessings be upon him) said: "I used to think that if anyone were to be spared the squeezing of the grave, it would be Sayyiduna Sa'd bin Mu'adh (may Allah be pleased with him); yet he too was squeezed once."
Hadith Referenceالمعجم الأوسط / باب الألف / 1159
Hadith Gradingمحدثین:مرسل، وفي إسناده من لا يُعرف
Hadith Takhrij«قال الهيثمي: وهو مرسل وفي إسناده من لم أعرفه «مجمع الزوائد ومنبع الفوائد، ج 3، ص 47»»