عَنْ أَبِي بَكْرَةَ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ لَا يَقُولَنَّ أَحَدُكُمْ إِنِّي قُمْتُ رَمَضَانَ كُلَّهُ أَوْ صُمْتُهُ قَالَ فَلَا أَدْرِي أَكَرِهَ التَّزْكِيَةَ أَمْ لَا بُدَّ مِنْ غَفْلَةٍ أَوْ رَقْدَةٍ
Sayyiduna Abu Bakrah (may Allah be pleased with him) said that the Noble Prophet (peace and blessings be upon him) said: No man should ever say that he stood (in prayer) for the entire Ramadan or that he fasted the entire Ramadan. The narrator says: I could not understand whether the Prophet (peace and blessings be upon him) meant that a person should not declare his own purity, or if there was some other intention, therefore it is necessary that some heedlessness be adopted, or that one should sleep.