Hadith
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ حُمَيْدِ بْنِ عَبْدِ الرَّحْمَنِ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، وَعُثْمَانَ بْنَ عَفَّانَ، كَانَا يُصَلِّيَانِ الْمَغْرِبَ حِينَ يَنْظُرَانِ إِلَى اللَّيْلِ الأَسْوَدِ قَبْلَ أَنْ يُفْطِرَا ثُمَّ يُفْطِرَانِ بَعْدَ الصَّلاَةِ وَذَلِكَ فِي رَمَضَانَ .
Yahya related to me from Malik from Ibn Shihab from Humayd ibn Abd ar-Rahman that Umar ibn al-Khattab and Uthman ibn Affan would pray maghrib when they saw the night darkening, before they broke their fast, and that was during Ramadan
Da'if · Salim al-Hilali
Muwatta Malik 638 ·Book 18, Hadith 9·Also available on sunnah.com·