(38) باب التَّسْهِيلِ فِي صِيَامِ يَوْمِ الشَّكِّ
It was narrated from Abu Hurairah that the Messenger of Allah used to say:
"Do not fast one or two days ahead of the month, unless the one who used to observe a regular fast. In that case let him fast." ' (ES)
Reference (ES): Sunan an-Nasa'i 2190 (ES)
In-book reference (ES): Book 22, Hadith 101 (ES)
English translation (ES): Vol. 3, Book 22, Hadith 2192 (ES)