It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that Abu al-Qasim (peace and blessings be upon him) said: By Him in Whose hand is the life of Muhammad (peace and blessings be upon him), if you knew what I know, you would begin to weep much and laugh little.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 10528
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد حسن، خ: 6637