Narrated Ibn `Abbas:
The Prophet (peace be upon him) was the most generous of all the people, and he used to become more generous in Ramadan when Gabriel met him. Gabriel used to meet him every night during Ramadan to revise the Qur’an with him. Allah’s Messenger (peace be upon him) then used to be more generous than the fast wind.
(Sahih al-Bukhari, Vol. 4, Book 61, Hadith 63)