It was
narrated that Abu Hurairah said:
"(The months in which) We fasted twenty-nine days at the time of the Messenger of Allah (ﷺ), were
more than (the months in which) we fasted thirty days. (FR)
English reference (FR): Vol. 1, Book 7, Hadith 1658 (FR)
Arabic reference (FR): Book 7, Hadith 1727 (FR)