Sahih Bukhari | Volume 6 | Hadith Number 489

Narrated by Abu Ubaida
I asked 'Aisha 'regarding the verse: 'Verily we have granted you the Kauthar.' She replied, "The Kauthar is a river which has been given to your Prophet on the banks of which there are (tents of) hollow pearls and its utensils are as numberless as the stars."