(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." (RU)
Reference (RU): Jami` at-Tirmidhi 698 (RU)
In-book reference (RU): Book 8, Hadith 17 (RU)
English translation (RU): Vol. 2, Book 3, Hadith 698 (RU)