بُلُوغُ الْمَرَامِ
Bulugh al-Maram 650
Fasting
عَنْ أَبِي هُرَيْرَةَ - رضى الله عنه - قَالَ: قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ لَا تَقَدَّمُوا رَمَضَانَ بِصَوْمِ يَوْمٍ وَلَا يَوْمَيْنِ, إِلَّا رَجُلٌ كَانَ يَصُومُ صَوْمًا, فَلْيَصُمْهُ } مُتَّفَقٌ عَلَيْهِ [1] .
Abu Hurairah (RAA) narrated that The Messenger of Allah (ﷺ) said: "None of you should fast a day or two before the (beginning of the) mouth of Ramadan, unless it is a day on which one is in the habit of fasting (i.e. voluntary fasting that coincides with that day).” Agreed upon.
Arabic/English book reference: Book 5, Hadith 671