(12) باب مَا جَاءَ إِذَا أَقْبَلَ اللَّيْلُ وَأَدْبَرَ النَّهَارُ فَقَدْ أَفْطَرَ الصَّائِمُ
Umar bin Al-Khattab narrated that:
The Messenger of Allah said: "When the night advances and the day retreats, and the sun is hidden, then the fast is to be broken." (IT)
Reference (IT): Jami` at-Tirmidhi 698 (IT)
In-book reference (IT): Book 8, Hadith 17 (IT)
English translation (IT): Vol. 2, Book 3, Hadith 698 (IT)