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