It wasnarrated from Ibn 'Umar that the Messenger of Allah (ﷺ)said:
"Kauthar is a river in Paradise whose banks are of gold and itsbedis of rubies and pearls. Its soil is more fragrant than musk, itswater is sweeter than honey and whiter than snow." (DE)
English reference (DE): Vol. 5, Book 37, Hadith 4334 (DE)
Arabic reference (DE): Book 37, Hadith 4478 (DE)