The Messenger of Allah (may Allah bless him and grant him peace) says, “Ramadan has come to you. (It is) a month of blessing, in which Allah covers you with blessing, for He sends down Mercy, decreases sins and answers prayers. In it, Allah looks at your competition (in good deeds), and boasts about you to His angels. So show Allah goodness from yourselves, for the unfortunate one is he who is deprived in (this month) of the mercy of Allah, the Mighty, the Exalted.”
[Narrated by Tabarani]

Abu Umaamah r.a.a. said: I said: ‘O Messenger of Allah, tell me of an action by which I may enter Paradise’. He said: ‘Take to Fasting, there is nothing like it.’ [An-Nasaa’ee, Ibn Hibbaan, Al-Haakim, Saheeh]
“Fasting is prescribed for you as it was prescribed for those before you, that you may attain taqwaa.” [2:183]