Arabic (Original)
وَقَالَ وَالَّذِي نَفْسُ مُحَمَّدٍ بِيَدِهِ لَوْ تَعْلَمُونَ مَا أَعْلَمُ لَبَكَيْتُمْ كَثِيرًا وَلَضَحِكْتُمْ قَلِيلًا.
English Translation
And he said: "By the One in Whose hand is the soul of Muhammad, if you knew what I know, you would weep much and laugh little."