[Machine] Uthman and Ali used to pray the Maghrib prayer while looking at the dark night, then they would break their fast after the prayer. This was in Ramadan. Ash-Shafi'i said in Al-Mabsut that it seems they intentionally delayed breaking their fast because they preferred to leave it after it was permissible for them, and they became those who break their fast without eating or drinking. This is because fasting is not valid at night.  

وَعُثْمَانَ ؓ كَانَا يُصَلِّيَانِ الْمَغْرِبَ حِينَ يَنْظُرَانِ إِلَى اللَّيْلِ الْأَسْوَدِ ثُمَّ يُفْطِرَانِ بَعْدَ الصَّلَاةِ وَذَلِكَ فِي رَمَضَانَ قَالَ الشَّافِعِيُّ فِي الْمَبْسُوطِ كَأَنَّهُمَا يَرَيَانِ تَأْخِيرَ ذَلِكَ وَاسِعًا؛ لِأَنَّهُمَا يَعْمَدَانِ الْفَضْلَ لِتَرْكِهِ بَعْدَ أَنْ أُبِيحَ لَهُمَا وَصَارَا مُفْطِرَيْنِ بِغَيْرِ أَكْلٍ وَشُرْبٍ؛ لِأَنَّ الصَّوْمَ لَا يَصْلُحُ فِي اللَّيْلِ