#15 Fasting continuous

Book of Fasting

(53) Chapter: Fasting and non-fasting (periods) of the Prophet saws.

Hadith 1971

Narrated Ibn `Abbas:

The Prophet (صلى الله عليه و سلم) never fasted a full month except the month of Ramadan, and he used to fast till one could say, "By Allah, he will never stop fasting," and he would abandon fasting till one would say, "By Allah, he will never fast."