Baqiyya bin al-Walid bin Sa'aid بقية بن الوليد بن صائد · The Book of Fasting

"I said to 'Aishah: 'Among us there are two men, one of whom hastens Iftar and delays Sahur, and the other delays Iftar and hastens Sahur.' She said; 'Which of them is the one who hastens Iftar and delays Sahur?' I said: "Abdullah bin Masud.' She said; 'This is what the Messenger of Allah used to do."'

"The Prophet used to fast Shaban." '

"The Messenger of Allah used to fast until we said: 'He will not break his fast.' And he used not to fast until we said: 'He will not fast.' And I never saw the Messenger of Allah fast more in any month than in Shaban."

"The Messenger of Allah used to fast (all of) Shaban except a little."