Mhmwd bin Khalid محمود بن خالد · Fasting (Kitab Al-Siyam)

Once the people doubted the appearance of the moon of Ramadan, and intended neither to offer the tarawih prayer nor to keep fast. A bedouin came from al-Harrah and testified that he had sighted the moon. He was brought to the Prophet (ﷺ). He asked: Do you testify that there is no god but Allah, and that I am the Messenger of Allah? He said: Yes; and he testified that he had sighted the moon. He commanded Bilal who announced…

The Prophet (ﷺ) as saying: A man who cups and a man who gets himself cupped break their fast.