عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ: ((لَا تَقَدَّمُوا بَيْنَ يَدَيْ رَمَضَانَ بِيَوْمٍ وَلَا يَوْمَيْنِ إِلَّا رَجُلًا كَانَ يَصُومُ صَوْمًا فَلْيَصُمْهُ))
It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: Do not fast one or two days before Ramadan, except for a person who habitually fasts on a particular day, then he may fast on that day.