C83 · Jami’ At-Tirmidhi - The Book on Salat (Prayer), Hadith 438 (Grade: Sahih - Authentic, Al-Albani; Hasan Sahih, At-Tirmidhi)
أَفْضَلُ الصِّيَامِ بَعْدَ شَهْرِ رَمَضَانَ شَهْرُ اللَّهِ الْمُحَرَّمُ وَأَفْضَلُ الصَّلاَةِ بَعْدَ الْفَرِيضَةِ صَلاَةُ اللَّيْلِ
Abu Hurairah narrated that Allah's Messenger (ﷺ) said: "The most virtuous fasting after the month of Ramadan is that of Allah's month of Al-Muharram. And the most virtuous Salat after the obligatory is the night prayer."
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