حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَمُحَمَّدُ بْنُ بَشَّارٍ، قَالاَ حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، عَنْ سُفْيَانَ بْنِ حُسَيْنٍ، عَنْ عَلِيِّ بْنِ زَيْدٍ، عَنْ أَنَسِ بْنِ حَكِيمٍ الضَّبِّيِّ، قَالَ قَالَ لِي أَبُو هُرَيْرَةَ إِذَا أَتَيْتَ أَهْلَ مِصْرِكَ فَأَخْبِرْهُمْ أَنِّي، سَمِعْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يَقُولُ ‏"‏ إِنَّ أَوَّلَ مَا يُحَاسَبُ بِهِ الْعَبْدُ الْمُسْلِمُ يَوْمَ الْقِيَامَةِ الصَّلاَةُ الْمَكْتُوبَةُ فَإِنْ أَتَمَّهَا وَإِلاَّ قِيلَ انْظُرُوا هَلْ لَهُ مِنْ تَطَوُّعٍ فَإِنْ كَانَ لَهُ تَطَوُّعٌ أُكْمِلَتِ الْفَرِيضَةُ مِنْ تَطَوُّعِهِ ثُمَّ يُفْعَلُ بِسَائِرِ الأَعْمَالِ الْمَفْرُوضَةِ مِثْلُ ذَلِكَ ‏"‏ ‏.‏

It wasnarrated that Anas bin Hakim Dabbi said: “Abu Hurairah said tome:‘When you go to your country, tell them that I heard the Messengerof Allah (PBUH) say: “The first thing for which the Muslim will bebrought to account on the Day of Resurrection will be the prescribedprayers. If they are complete, all well and good, otherwise it willbesaid: ‘Look and see whether he has any voluntary prayers.’ Ifhe hasany voluntary prayers, his prescribed prayers will becompleted fromhis voluntary prayers. Then the same will be done withregard to allhis obligatory deeds.” Translation Not Available

Book Ref: Sunan Ibn Majah Book 5 Hadith 1425
Web Ref:  Sunan Ibn Majah Vol 1 Book 5 Hadith 1425