Narrated `Umar bin Al-Khattab: Allah's Apostle said, "When night falls from this side and the day vanishes from this side and the sun sets, then the fasting person should break his fast."
Hadith Referenceصحيح البخاري / كتاب الصوم / 1954
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة