Sahih al-Bukhari Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) Abu Bishr Sahih 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.” https://parallelquran.com/hadith/sahih-al-bukhari-4760/ Sahih Muslim The Book of Fasting Abu Bishr Sahih ” During any month continuously since he came to Medina.” https://parallelquran.com/hadith/sahih-muslim-2609/