Sunan At-Tirmidhi

Muhammad bin Abi Harmalah narrated:""Kuraib informed me that Umm Al-Fadl bin Al-Harith sent him to Mu'awiyah in Ash-Sham. He said: 'So I arrived in Ash-Sham and finished her errand, and I saw the crescent of Ramadan while I was in Ash-Sham. We saw the crescent on the night of Friday. Then I arrived in Al-Madinah at the end of the month. Ibn Abbas was questioning me, then he mentioned the crescent and he said: ""When did you see the crescent?"" I said: ""We saw it n the night of Friday."" He said: ""Did you see it on the night of Friday?"" I said: ""The people saw it, so they fasted, and Mu'awiyah fasted."" He said: ""But we saw it on the night of Saturday, so we will not stop fasting until we complete thirty days or we see it."" So I said: ""Is not the sighting and fasting of Mu'awiyah enough for you?"" He said: ""This is not how the Messenger of Allah ordered us