Sahih al-Bukhari 6486
Sahih al-Bukhari · Book 81: To make the Heart Tender (Ar-Riqaq) · "If you knew that which I know, you would laugh little and weep much"
Narrated Anas:
حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ ، حَدَّثَنَا شُعْبَةُ ، عَنْ مُوسَى بْنِ أَنَسٍ ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " لَوْ تَعْلَمُونَ مَا أَعْلَمُ لَضَحِكْتُمْ قَلِيلاً وَلَبَكَيْتُمْ كَثِيرًا"
The Prophet (ﷺ) said, "If you knew that which I know, you would laugh little and weep much."