It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said:"The first thing for which a person will be brought to account will be his Salah. If it is complete (all well and good), otherwise Allah will say: 'Look and see if My slave did any voluntary prayer.' If he is found to have done voluntary prayers, his obligatory prayers will be completed therewith

English translation · Sunan an-Nasa'i