It is narrated from Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with him) that he said: "This verse was revealed concerning the Negus (al-Najashi): 'And when they hear what has been sent down to the Messenger, you see their eyes overflowing with tears' [Surah al-Ma'idah: 83]."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13855