Abdullah bin Abbas reported,
The Messenger of Allah ﷺ was the most generous of people, and he was at his most generous during Ramadan when Jibreel would meet with him. Jibreel used to meet him every night during the month of Ramadan to review the Quran with him. When Jibreel 
met him, the Messenger of Allah ﷺ was more generous in doing good than the sweeping wind.
Nasai 2097
Sahihأخبرنا سليمان بن داود عن ابن وهب قال أخبرني يونس عن ابن شهاب عن عبيد الله بن عبد الله بن عتبة أن
عبد الله بن عباس كان يقول
كان رسول الله ﷺ أجود الناس وكان أجود ما يكون في رمضان حين يلقاه جبريل وكان جبريل يلقاه في كل ليلة من شهر رمضان فيدارسه القرآن قال كان رسول الله ﷺ حين يلقاه جبريل عليه السلام أجود بالخير من الريح المرسلة
Bukhari narrated it in the Book of the Beginning of Revelation, in the chapter titled "How the Revelation Began to Come to the Messenger of Allah ﷺ," etc., hadith no. 6, and Muslim narrated it in the Book of Virtues, in the chapter "The Prophet ﷺ Was the Most Generous of People in Giving Good, Like a Blowing Wind," hadith no. 2308, both from the hadith of Yunus bin Yazid Ayli, with the same wording. It is also found in Al-Kubra, hadith no. 2405.