Sunnah.com reference : Book 8, Hadith 75English translation : Book 8, Hadith 1038Arabic reference : Book 8, Hadith 1028
Narrated Abu Salamah bin 'Abdur-Rahman (RA):
I asked 'Aishah (RA), "How much had Allah's Messenger (ﷺ) given as dowry?" She replied, "His dowry to his wives was twelve Uqiya and Nashsh." She asked, "Do you know what a an-Nashsh is?" I replied, "No." She said, "It is half an Uqiya. Hence, the total was five hundred Dirhams, and that was Allah's Messenger's (ﷺ) dowry to his wives."

[Reported by Muslim].
وَعَنْ أَبِي سَلَمَةَ بْنِ عَبْدِ اَلرَّحْمَنِ ; أَنَّهُ قَالَ : { سَأَلْتُ عَائِشَةَ زَوْجَ اَلنَّبِيِّ ‏- صلى الله عليه وسلم ‏-كَمْ كَانَ صَدَاقُ رَسُولِ اَللَّهِ ‏- صلى الله عليه وسلم ‏-قَالَتْ : كَانَ صَدَاقُهُ لِأَزْوَاجِهِ ثِنْتَيْ عَشْرَةَ أُوقِيَّةً وَنَشًّا .‏ قَالَتْ : أَتَدْرِي مَا اَلنَّشُّ ? قَالَ : قُلْتُ : لَا .‏ قَالَتْ : نِصْفُ أُوقِيَّةٍ .‏ فَتِلْكَ خَمْسُمِائَةِ دِرْهَمٍ , فَهَذَا صَدَاقُ رَسُولِ اَللَّهِ ‏- صلى الله عليه وسلم ‏-لِأَزْوَاجِهِ }  رَوَاهُ مُسْلِمٌ  1‏ .‏‏1 ‏- صحيح .‏ رواه مسلم ( 1426 )‏.‏