Hadith 5566
عَنْ أَنَسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: بَيْنَا أَنَا أَسِيرُ فِي الجنَّةِ إِذا أَنا بنهر حافتاه الدُّرِّ الْمُجَوَّفِ قُلْتُ: مَا هَذَا يَا جِبْرِيلُ؟ قَالَ: الْكَوْثَرُ الَّذِي أَعْطَاكَ رَبُّكَ فَإِذَا طِينُهُ مِسْكٌ أذفر . رَوَاهُ البُخَارِيّ
Anas reported God's messenger as saying, "While I was travelling in paradise, I came to a river whose banks were domes of hollowed pearls, and when I asked Gabriel what this was, he replied that it was al-Kauthar* which my Lord had given me. Its soil was the most excellent musk." *Quran, 108. Bukhari transmitted it.