Sahih al-Bukhari — Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))

Sa`id bin Jubair said that Ibn `Abbas said about Al-Kauthar. “That is the good which Allah has bestowed upon His Apostle.” I said to Sa`id bin Jubair. “But the people claim that it is a river in Paradise.” Sa`id said, “The river in Paradise is part of the good which Allah has bestowed on His Apostle.”

” During any month continuously since he came to Medina.”