حَدَّثَنَا سُفْيَانُ عَنْ هِشَامٍ عَنْ أَبِيهِ عَنْ عَاصِمِ بْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُ عَنْ أَبِيهِ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ إِذَا أَقْبَلَ اللَّيْلُ وَأَدْبَرَ النَّهَارُ وَغَرَبَتْ الشَّمْسُ فَقَدْ أَفْطَرَ الصَّائِمُ
مسند امام احمد بن حنبل · Hadith 338
It was narrated from 'Asim bin 'Umar from his father that the Prophet (PBUH) said: "When night comes and day departs and the sun sets, the fasting person may break his fast."
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020