It is narrated that the Prophet ﷺ said:

"Verily, Ramadan is a month in which Allah Almighty has obligated its fasting. I have instituted for Muslims the practice of prayer at night. Thus, whoever fasts it with faith and expecting reward will be rid of sins like the day he was born from his mother."

This Hadith emphasizes the dual nature of Ramadan: the obligation of the daytime fast and the recommended night prayer (Tarawih). When these are performed with Imaan (faith) and Ihtisab (seeking reward), they result in a profound spiritual purification.