Anas bin Hakeem, may Allah have mercy on him, says that Abu Hurairah, may Allah be pleased with him, said to me: When you reach your townspeople, inform them that I heard the Noble Prophet, peace and blessings be upon him, say: On the Day of Resurrection, the first thing for which a servant will be called to account will be the obligatory prayers. If they are found to be correct, then very good; otherwise, they will be supplemented with voluntary prayers. After that, the same will be done with the other obligatory deeds.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7902