“A man came to the Prophet ﷺ and said: ‘Which fasting is better after the month of Ramadan?’ He said: ‘The month of Allah which is called Muharram.’” (Using translation from Ibn Mājah 1742)
أَنَّ النَّبِيَّ ﷺ قَالَ «أَفْضَلُ الصِّيَامِ بَعْدَ شَهْرِ رَمَضَانَ شَهْرُ اللَّهِ الَّذِي تَدْعُونَهُ الْمُحَرَّمَ»