Fast on 3 specific days every month and do as many good deeds as possible in order to receive more reward from Allah and increase one's faithfulness towards Him .

This hadith, narrated by Abu Dharr, speaks about the rewards of fasting. It states that whoever fasts for three days in each month has fasted for a lifetime. This means that if someone fasts on three specific days every month, they will be rewarded as if they have fasted throughout their entire life. Additionally, Allah rewards good deeds with ten times the like thereof. This means that whatever good deed someone does will be rewarded with ten times its value from Allah. Therefore, it is important to do as many good deeds as possible in order to receive more reward from Allah and increase one's faithfulness towards Him.