I asked ʿAisha '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."
سَأَلْتُهَا عَنْ قَوْلِهِ تَعَالَى {إِنَّا أَعْطَيْنَاكَ الْكَوْثَرَ} قَالَتْ نَهَرٌ أُعْطِيَهُ نَبِيُّكُمْ ﷺ شَاطِئَاهُ عَلَيْهِ دُرٌّ مُجَوَّفٌ آنِيَتُهُ كَعَدَدِ النُّجُومِ رَوَاهُ زَكَرِيَّاءُ وَأَبُو الأَحْوَصِ وَمُطَرِّفٌ عَنْ أَبِي إِسْحَاقَ