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 (ﷺ) 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."
English reference: Vol. 1, Book 5, Hadith 1425
Arabic reference: Book 5, Hadith 1491