SINCERE FASTING IN RAMADAN H 1244 "Whosoever observes the fast during Ramadan through sincerity of belief and in hope of earning merit will have his past sins forgiven him." R 1244 Bukhari and Muslim with a chain up to Abu Hurairah who related that the Messenger of Allah, praise and peace be upon him, said this.
1219- وعن أَبي هريرة رضي الله عنه ، عن النبيِّ صلى الله عليه وآله وسلم ، قَالَ : "مَنْ صَامَ رَمَضَانَ إيمَاناً وَاحْتِسَاباً ، غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ" متفقٌ عَلَيْهِ .