'I fasted Ramadan' or 'I prayed Qiyam throughout the whole month."' I do not know whether he dislike self-praise or he said: "Inevitably there will be heedlessness and sleep." (Da 'if)  

عَنِ النَّبِيِّ ﷺ قَالَ لاَ يَقُولَنَّ أَحَدُكُمْ صُمْتُ رَمَضَانَ وَلاَ قُمْتُهُ كُلَّهُ وَلاَ أَدْرِي كَرِهَ التَّزْكِيَةَ أَوْ قَالَ لاَ بُدَّ مِنْ غَفْلَةٍ وَرَقْدَةٍ اللَّفْظُ لِعُبَيْدِ اللَّهِ  

The Prophet ﷺ said: One of you should not say: I fasted the whole of Ramadan, and I prayed during the night in the whole of Ramadan. I do not know whether he disliked the purification; or he (the narrator) said: He must have slept a little and taken rest.  

قَالَ رَسُولُ اللَّهِ ﷺ لاَ يَقُولَنَّ أَحَدُكُمْ إِنِّي صُمْتُ رَمَضَانَ كُلَّهُ وَ قُمْتُهُ كُلَّهُ فَلاَ أَدْرِي أَكَرِهَ التَّزْكِيَةَ أَوْ قَالَ لاَ بُدَّ مِنْ نَوْمَةٍ أَوْ رَقْدَةٍ  

'I fasted Ramadan' or 'I prayed Qiyam throughout the whole month."' I do not know whether he dislike self-praise or he said: "Inevitably there will be heedlessness and sleep." (Da 'if) (Using translation from Nasāʾī 2109)   

عَنِ النَّبِيِّ ﷺ قَالَ لَا يَقُولَنَّ أَحَدُكُمْ إِنِّي قُمْتُ رَمَضَانَ كُلَّهُ وَصُمْتُهُ قَالَ فَلَا أَدْرِي أَكَرِهَ التَّزْكِيَةَ أَمْ لَا بُدَّ مِنْ غَفْلَةٍ أَوْ رَقْدَةٍ  

The Prophet ﷺ said: One of you should not say: I fasted the whole of Ramadan, and I prayed during the night in the whole of Ramadan. I do not know whether he disliked the purification; or he (the narrator) said: He must have slept a little and taken rest. (Using translation from Abū Dāʾūd 2415)   

عَنِ النَّبِيِّ ﷺ قَالَ «لَا يَقُولَنَّ أَحَدُكُمْ إِنِّي صُمْتُ رَمَضَانَ كُلَّهُ وَقُمْتُهُ» قَالَ فَلَا أَدْرِي أَكَرِهَ التَّزْكِيَةَ أَمْ قَالَ «لَا بُدَّ مِنْ رَقْدَةٍ أَوْ غَفَلَةٍ»