Hadith #2422 (Sunan al-Nasa'i)
Book: The Book of Fasting
Narrator(s): Abu Dharr al-Ghaffari, al-Fadl bin Musa al-Synany الفضل بن موسى السيناني, Muhammad bin 'Abdul 'Aziz bin al-Wasti محمد بن عبد العزيز العمري الرملي بن الوا, Musa ibn Talha, Yahya bin Sam يحيى بن سام

the Messenger of Allah used to fast nine days of Dhul-Hijjah, the day of ‘Ashura’, and three days of each month: The first Monday of the month, and two Thursday.

Source: https://parallelquran.com/hadith/sunan-al-nasai-2422/

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Hadith #2423 (Sunan al-Nasa'i)
Book: The Book of Fasting
Narrator(s): Abdur Rahman bin Mahdi عبد الرحمن بن مهدي, Abu Dharr al-Ghaffari, Musa ibn Talha, Shu'bah bin al-Hajjaj شعبة بن الحجاج, Sulaiman al-A'mash الأعمش / سليمان بن مهران, Yahya bin Sam يحيى بن سام

“The Prophet used to fast the ten (days), and three days of each month: Monday and Thursday.”

Source: https://parallelquran.com/hadith/sunan-al-nasai-2423/

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Hadith #2424 (Sunan al-Nasa'i)
Book: The Book of Fasting
Narrator(s): Abdur Rahman bin Mahdi عبد الرحمن بن مهدي, Musa ibn Talha, Shu'bah bin al-Hajjaj شعبة بن الحجاج, Sulaiman al-A'mash الأعمش / سليمان بن مهران, Yahya bin Sam يحيى بن سام

“The Messenger of Allah used to enjoin fasting three days: The first Thursday, and Monday and Monday.”

Source: https://parallelquran.com/hadith/sunan-al-nasai-2424/

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Hadith #761 (Jami' al-Tirmidhi)
Book: The Book on Fasting
Narrator(s): Abu Da'ud أبو داود السجستاني الأزدي, Abu Dharr al-Ghaffari, Mahmud bin Ghaylan محمود بن غيلان العدوي مولاهم أبو أحمد, Musa ibn Talha, Shu'bah bin al-Hajjaj شعبة بن الحجاج, Sulaiman al-A'mash الأعمش / سليمان بن مهران, Yahya bin Sam يحيى بن سام

the Messenger of Allah said: “O Abu Dharr! When you fast three days out of a month, then fast the thirteenth, fourteenth, and fifteenth.”

Source: https://parallelquran.com/hadith/jami-al-tirmidhi-761/