BEST VOLUNTARY PRAYER H 1190 "The best month in which to fast after Ramadan is Muharram, and the best prayer after the obligatory prayers is prayer at night." R 1190 Muslim with a chain up to Abu Hurairah who related that the Messenger of Allah, praise and peace be upon him, said this.
1167- وعن أَبي هريرة رضي الله عنه ، قَالَ : قَالَ رسولُ اللهِ صلى الله عليه وآله وسلم : "أفْضَلُ الصِّيَامِ بَعْدَ رَمَضَانَ : شَهْرُ اللهِ المُحَرَّمُ ، وَأفْضَلُ الصَّلاَةِ بَعْدَ الفَرِيضَةِ : صَلاَةُ اللَّيْلِ" رواه مسلم .