question #1 Sahih al-Bukhari 4964, Book 65, Hadith 486 : What is the significance of the River Kauthar in Islamic belief?

When the Prophet (ﷺ) was made to ascend to the Heavens, he said (after his return), “I came upon a river
the banks of which were made of tents of hollow pearls. I asked Gabriel. What is this (river?) He replied, ‘This is the Kauthar.’