Enjoinment of Fasting of Ones Own Accord

The Prophet (SAWA) said, ‘He who fasts a single day of his own accord is rewarded to such an extent that even if he was to be given the whole worlds worth of gold for it, the reward he deserves would not be fulfilled until the Day of Resurrection.

The Prophet (SAWA) said, ‘He who fasts a single day of his own accord, wishing to procure the reward of Allah, [Allah makes] his forgiveness mandatory.

The Prophet (SAWA) said, ‘Whoever [voluntarily] fasts three days every month is considered as having fasted his whole life, for verily Allah, Mighty and Exalted, says, “Whoever brings virtue shall receive ten times its like”

Imam al-Sadiq (AS) said, ‘Verily when a man fasts a single day of his own accord, desiring thereby what is with Allah, Mighty and Exalted, Allah gives him entrance into Paradise because of it.