Prayer offered in the middle of the night and the most excellent fast after (fasting) in the month of Ramadan is the fast in God's month al-Muharram.
Sahih Muslim Book 13, Hadith 262
← Previous Hadith The most excellent fast after Ramadan is God's month. al-Muharram, and the most excellent prayer after what is prescribed is prayer during the night.

Sahih Muslim Book 13, Hadith 261 Next Hadith → A hadith like this has been reported from the Messenger of Allah (ﷺ) by 'Abd al-Malik with the same chain of transmitters in connection with fast.

Sahih Muslim Book 13, Hadith 263