Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "The best month for observing Saum (fasting) after Ramadan is Muharram, and the best Salat after the prescribed Salat is Salat at night."[Muslim].
App reference: Book 9, Hadith 177
Arabic/English book reference: Book 9, Hadith 1167