Hadith #2321 (Sunan Abi Dawud)
Book: Fasting (Kitab Al-Siyam)
Narrator(s): Ahmed bin Manay' أحمد بن منيع, Amr bin al-Harith bin Abi Darar, ibn Mas'ud, Isa bin Dinar al-Khuza'i عيسى بن دينار الخزاعي أبو علي, Yahya bin Zakaria bin Abi Zaida يحيى بن زكريا بن أبي زائدة
Grade: Da'if

‘Umar b. ‘Abd al-‘Aziz wrote (a letter) to the people of Basrah: It has reached us from the Messenger of Allah (ﷺ), like the tradition narrated by Ibn ‘Umar from the Prophet (ﷺ). This version adds: The best calculation is that when we sight the moon of Sha’ban on such-and-such date, fasting will being on such-and-such dates, Allah willing, except they they sight the moon before that (date).

Source: https://parallelquran.com/hadith/sunan-abi-dawud-2321/

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Hadith #689 (Jami' al-Tirmidhi)
Book: The Book on Fasting
Narrator(s): Ahmed bin Manay' أحمد بن منيع, Amr bin al-Harith bin Abi Darar, ibn Mas'ud, Isa bin Dinar al-Khuza'i عيسى بن دينار الخزاعي أبو علي, Yahya bin Zakaria bin Abi Zaida يحيى بن زكريا بن أبي زائدة

“What I fasted with the Prophet that was twenty-nine (days), was more than what we fasted that was thirty.” (He said): There are narrations on this topic from `Umar, Abu Hurairah, `A’isha, Sa`d bin Abi Waqqas, Ibn `Abbas, Ibn `Umar, Anas, Jabir, Umm Salamah, Abu Bakrah, that the Prophet (ﷺ) said: “The month is twenty nine (days).”

Source: https://parallelquran.com/hadith/jami-al-tirmidhi-689/