Virtues and Merits of the Prophet (pbuh) and his Companions

Bukhari :: Book 4 :: Volume 56 :: Hadith 754

Narrated Ibn Abbas:

The Prophet 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 Apostle then used to be more generous than the fast wind.