سنن ابن ماجه
Sunan Ibn Majah
كتاب الصيام
The Book of Fasting
بَابُ : مَا جَاءَ فِي النَّهْيِ عَنْ أَنْ يَتَقَدَّمَ رَمَضَانَ بِصَوْمٍ إِلاَّ مَنْ صَامَ صَوْمًا فَوَافَقَهُ
Chapter: What was narrated concerning the prohibition of anticipating Ramadan by fasting before it, except for one who has a habitual pattern of fasting and it coincides with that
2 hadith
Hadith 1650
´It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said:` ‘Do not anticipate Ramadan by fasting one or two days before, except for a man who has a habitual pattern of fasting, in which case let him fast.”
Hadith 1651
´It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said:` ‘When it is the middle of Sha’ban, do not fast until Ramadan comes.”