Sunan Abi Dawud Fasting (Kitab Al-Siyam) 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 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). https://parallelquran.com/hadith/sunan-abi-dawud-2321/ Jami' al-Tirmidhi The Book on Fasting 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).” https://parallelquran.com/hadith/jami-al-tirmidhi-689/