Hadith 4:179
Ali bin Mushir narrated to us, from al-Shaybani, from Jabalah bin Suhaym, from Ali bin Hanzalah, from his father, who said: I witnessed Umar bin al-Khattab during Ramadan, and a drink was brought near to him. Some of the people drank while they were of the opinion that the sun had set. Then the muezzin climbed up and said, "O Commander of the Faithful, by Allah, the sun is rising; it has not set." Umar said, "May Allah protect us from your evil," two or three times. "O people, whoever has broken his fast, let him fast a day in place of a day, and whoever has not broken his fast, let him complete it until the sun sets."
حدثنا علي بن مسهر عن الشيباني عن جبلة بن سحيم عن علي بن حنظلة عن أبيه قال شهدت عمر بن الخطاب في رمضان وقرب إليه شراب فشرب بعض القوم وهم يرون ان الشمس قد غربت ثم ارتقى المؤذن فقال يا امير المؤمنين والله للشمس طالعة لم تغرب فقال عمر منعنا الله من شرك مرتين أو ثلاثة يا هؤلاء من كان افطر فليصم يوما مكان يوم ومن لم يكن افطر فليتم حتى تغيب الشمس