"The Messenger of Allah ﷺ said: 'The best fasting after the month of Ramadan is the month of Allah, Al-Muharram, and the best prayer is prayer at night.'" (Using translation from Nasāʾī 1613)
كَانَ رَسُولُ اللهِ ﷺ يَقُولُ «إِنَّ أَفْضَلَ الصَّلَاةِ بَعْدَ الْمَفْرُوضَةِ الصَّلَاةُ فِي جَوْفِ اللَّيْلِ وَأَفْضَلَ الصِّيَامِ بَعْدَ رَمَضَانَ شَهْرُ اللهِ الَّذِي تَدْعُونَهُ الْمُحَرَّمَ»