(31) باب التَّقَدُّمِ قَبْلَ شَهْرِ رَمَضَانَ
It was narrated from Abu Hurairah that the Messenger of Allah said:
"Do not fast ahead of the month, except for a man who habitually fasts, and that day happenes to be one of his regular fasts." ' (DE)
Reference (DE): Sunan an-Nasa'i 2172 (DE)
In-book reference (DE): Book 22, Hadith 83 (DE)
English translation (DE): Vol. 3, Book 22, Hadith 2174 (DE)