It was narrated from Mu’adhah Al-Adawiyyah that 'Aishah said: "The Messenger of Allah ﷺ used to fast three days of each month". I said: "Which were they?" She said: "He did not care which days they were".
Fasting has many benefits, both physical and spiritual, such as improving one's health, increasing self-discipline, developing patience and perseverance, strengthening one's relationship with Allah SWT, among others. Therefore this hadith encourages us to take advantage of these benefits by fasting regularly throughout the year in order to become closer to Allah SWT and reap all its rewards in this life and the hereafter.