C80 · Sunan An-Nasa’i - The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day, Hadith 1613 (Grade: Sahih - Authentic)
أَفْضَلُ الصِّيَامِ بَعْدَ شَهْرِ رَمَضَانَ شَهْرُ اللَّهِ الْمُحَرَّمُ وَأَفْضَلُ الصَّلاَةِ بَعْدَ الْفَرِيضَةِ صَلاَةُ اللَّيْلِ
It was narrated from Humaid bin 'Abdur-Rahman - that is Ibn 'Awf - that Abu Hurairah said: "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.'"
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