Sunan al-Nasa'i The Book of Fasting Abdur Rahman bin Zayd ibn al-Khattab Abu al-Qasin al-Jadli أبو القاسم الجدلي / حسين بن الحارث Ibrahim bin Y'aqub bin Ishaq إبراهيم بن يعقوب بن إسحاق Yahya bin Zakaria bin Abi Zaida يحيى بن زكريا بن أبي زائدة “I came to Ash-Sham. He said: “I came to Ash-Sham and complete her errand. Then the new crescent of Ramadan was sighted while I was in Ash-Sham. I saw the new crescent on the night of Friday, then I came to Al-Madinah at the end of the month. ‘Abdullah bin ‘Abbas asked me about the sighting of the moon and said: ‘ When did you see it?’ I said: ‘We saw it on the night of Friday.’ He said; ‘You saw it on the ninth of Friday?’ I said: ‘Yes, and the people saw it and started fasting, and so did Muawiyah. He said: ‘But we saw it on the night of Saturday, so we will continue fasting until we have completed thirty days or we see it.’ I said: ‘Will you not be content with the sighting of Muawiyah and his companions? He said; ‘No; this is what the Messenger of Allah enjoined upon us.”‘ https://parallelquran.com/hadith/sunan-al-nasai-2116/