Hadith #4760 (Sahih al-Bukhari)
Book: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
Narrator(s): Abu Bishr
Grade: 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.”

Source: https://parallelquran.com/hadith/sahih-al-bukhari-4760/

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Hadith #2609 (Sahih Muslim)
Book: The Book of Fasting
Narrator(s): Abu Bishr
Grade: Sahih

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

Source: https://parallelquran.com/hadith/sahih-muslim-2609/