Praise be to Allah.
This action is better and brings a greater reward, and fasting three days (of every month) is included in that. The Prophet (blessings and peace of Allaah be upon him) used to fast on Mondays and Thursdays, and he used to say: “They are two days on which deeds are shown to Allaah, may He be glorified, and I would like my deeds to be shown (to Him) when I am fasting.” and Allaah is the source of strength. End quote.
Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allaah have mercy on him).