"None should fast one or two days ahead of the month except, someone who had a prior habit for fasting, in which case let him fast." '
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَتَقَدَّمَنَّ أَحَدٌ الشَّهْرَ بِيَوْمٍ وَلاَ يَوْمَيْنِ إِلاَّ أَحَدٌ كَانَ يَصُومُ صِيَامًا قَبْلَهُ فَلْيَصُمْهُ